I don't understand why they have to take simple addition, subtraction, multiplication, and division; throw it together in a weird way and make you break it down in to steps to solve it. What is the point of Algebra?
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Algebra is stupid
post #2 of 47
2/28/08 at 5:58pm
There must be a point to it all.. I'm not sure what it is
post #3 of 47
2/28/08 at 6:00pm
 WELDRWOMN
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It is really a conspiracy to aggravate you. I could never figure out imaginary numbers. I figured if they are imaginary, then why can't I imagine them to be whatever I want?
post #4 of 47
2/28/08 at 6:00pm
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I agree. I did decently in math until we got to the prealgebra * algebra stuff. Then it all went down hill and never came back.
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2/28/08 at 6:03pm
 xLaydeexTaniax
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i hate algebra!
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2/28/08 at 6:19pm
 butzie
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Algebra is something that we use in everyday life. I liked this link originally posted by Essayons89:
http://www.act.org/compass/sample/prealg.html
Algebra helps you figure out how much to tip in a restaurant. You can figure out the tax on an item. You use it if you want to half a recipe, to figure out the MPG your car gets, what is the average temperature etc.
I think that the link really shows how we use algebra.
http://www.act.org/compass/sample/prealg.html
Algebra helps you figure out how much to tip in a restaurant. You can figure out the tax on an item. You use it if you want to half a recipe, to figure out the MPG your car gets, what is the average temperature etc.
I think that the link really shows how we use algebra.
post #7 of 47
2/28/08 at 6:23pm
 WELDRWOMN
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Quote:
Algebra is something that we use in everyday life. I liked this link originally posted by Essayons89:
http://www.act.org/compass/sample/prealg.html Algebra helps you figure out how much to tip in a restaurant. You can figure out the tax on an item. You use it if you want to half a recipe, to figure out the MPG your car gets, what is the average temperature etc. I think that the link really shows how we use algebra. 
That is all very useful and correct, but tell me, when exactly do you use imaginary numbers? In case you are wondering, I am rather hung up on the whole imaginary number thing...
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2/28/08 at 6:32pm
 ClaireBear
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I never liked algebra either. To me it just takes something simple and makes it harder to figure out.
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2/28/08 at 6:33pm
 laureen227
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it's supposed to teach you to think logically.
that said  if so, then why wasn't i allowed to use a calculator for the computational side? i could set up the problem perfectly, then get the wrong answer because i have computational issues! [i should say HAD computational issues  i've gotten quite a bit better since i became a teacher!]
that said  if so, then why wasn't i allowed to use a calculator for the computational side? i could set up the problem perfectly, then get the wrong answer because i have computational issues! [i should say HAD computational issues  i've gotten quite a bit better since i became a teacher!]
post #10 of 47
2/28/08 at 6:56pm
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That is all very useful and correct, but tell me, when exactly do you use imaginary numbers? In case you are wondering, I am rather hung up on the whole imaginary number thing...

For anyone who wants to know what an imaginary number is:
Imaginary number "i" or "j" gets written in when you are solving an equation and need to find the square root of a negative number. Negative numbers don't have square roots because a negative number times a negative number is a positive number. A positive number times a positive number is a positive number. So there is nothing you can multiply times itself to get a negative number. Thus, we call the square root of negative one "i" or "j" as an example, the square root of 64 would be 8i. So 8i x 8i = 64.
In real life, electrical engineers use the imaginary number to process signals. (I'm taking a Signals and Systems course, and I'm doing OK in spite of the horrific midterm score I posted about recently. Phew! I'm not an electrical engineer...) Signals often are represented by a combination of terms containing both real and imaginary parts.
Aside from electromagnetic applications, I'm not sure how much good imaginary numbers are in everyday life.
post #11 of 47
2/28/08 at 6:56pm
 swooshfinn
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I use algebra everyday when I am designing kitchen cabinet layouts for people.
post #12 of 47
2/28/08 at 6:57pm
 lunasmom
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That is all very useful and correct, but tell me, when exactly do you use imaginary numbers? In case you are wondering, I am rather hung up on the whole imaginary number thing...

Other than that I use to love algebra. Math in general strengthens us our cognitive ability. For example the ability to get into a car and navigate ourselves around, find shortcuts etc. For example, without math, you wouldn't have the computer in front of you. Without 1s and 0s and having the ability to know 0,2,4,8,16,32,64, for RAM and such IT people would not exist.
It also has use with our bank accounts. Having algebra allows you to say to yourself: I can afford to put away $200 per month. I need to save $1500 for my Spring Break. How many months will it take to save this much?
So then 200 * x = 1500...so then x = 7.5 months.
post #13 of 47
2/28/08 at 7:08pm
 theimp98
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Algebra is ok, and yea, you do use many times in the real world every day.
trig was ok,
Calculus made my head hurt, and left me wondering what the heck did i just learn I got a B in it, but no idea why
hmm i had math class after the 2 calculus class, however that year is blank, i cant remember the horror of it.
trig was ok,
Calculus made my head hurt, and left me wondering what the heck did i just learn I got a B in it, but no idea why
hmm i had math class after the 2 calculus class, however that year is blank, i cant remember the horror of it.
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OK so 4(9)+5
_______
86(2) This equation says 4 times 9 plus five divided by 6 minus 8 times 2 which is 45. Why does the equation have to be formulated like that. Why not 4x9+5/86x2? It's the same thing only the first one can be confusing.
_______
86(2) This equation says 4 times 9 plus five divided by 6 minus 8 times 2 which is 45. Why does the equation have to be formulated like that. Why not 4x9+5/86x2? It's the same thing only the first one can be confusing.
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2/28/08 at 7:53pm
 kluchetta
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Because the second way is actually more confusing. You never use x to indicate a multiplier. Only a dot, or parenthesis.... the bottom part you showed  to me  mean 86x2, or 66x, or 6(1x) That is totally not the same thing as 8 minus negative 12.
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I remember in basic math though, 8x5 would mean 8 times 5. So why is the mutiplication symbol different in algebra.?
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2/28/08 at 7:58pm
 kluchetta
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Because Algebra is about finding the unknown. The unknown is x.
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2/28/08 at 8:01pm
 katachtig
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So you don't confuse it with the variable that you are solving for. Algebra are equations like 8 + x(9) = 20y. So using x as a multiplier would confuse things. (8 + xx9=20y)
post #19 of 47
2/28/08 at 8:01pm
Quote:
OK so 4(9)+5
_______ 86(2) This equation says 4 times 9 plus five divided by 6 minus 8 times 2 which is 45. Why does the equation have to be formulated like that. Why not 4x9+5/86x2? It's the same thing only the first one can be confusing. 
There's the order of operations. In your example, you would first do multiplication and division (It doesn't matter if you divide before you multiply since division is just multiplying by a fraction). Then, you would do the addition and subtraction.
The way you wrote the first equation, means that you take everything that's on top and divide it by everything thats on the bottom. On the top you get 36+5 = 31 and on the bottom 8+12 = 24. So your answer would be 31/24
The way you wrote the second one, means something different. You would have to follow the order of operations. In the second one, you would have to divide 5 by 8 before you could do any addition. So you would get 36 + (5/8) + 12 which is the same as 24 + (5/8). This is not the same as 31/24.
Phew! I hope it made sense!
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I'd rather x remain a mystery. Unfortunately I have to take Basic Algebra for college and I stink so bad I have to take a refresher course in Pre Algebra.
post #21 of 47
2/28/08 at 8:07pm
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OMG, this thread gives me a headache I CANNOT STAND MATH! (I suck at it)
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2/28/08 at 8:10pm
 Bonnie1965
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My head hurts!
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2/28/08 at 8:13pm
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post #24 of 47
2/28/08 at 8:37pm
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Quote:
Only when you're working on parallel universes I quit math after they introduced imaginary numbers. I kept arguing with the teacher saying that if the numbers are only imaginary then how can we know the result is real???
Other than that I use to love algebra. Math in general strengthens us our cognitive ability. For example the ability to get into a car and navigate ourselves around, find shortcuts etc. For example, without math, you wouldn't have the computer in front of you. Without 1s and 0s and having the ability to know 0,2,4,8,16,32,64, for RAM and such IT people would not exist. It also has use with our bank accounts. Having algebra allows you to say to yourself: I can afford to put away $200 per month. I need to save $1500 for my Spring Break. How many months will it take to save this much? So then 200 * x = 1500...so then x = 7.5 months. 
Why the heck cant you just say 1500 Divided by 200 = 7.5?? I dont mind algebra but the way things are worded to make it harder is silly! When I was in my algebra classes I switched everything they gave me into the way I saw it! hence 200* x =1500, I know I can say 1500/200 =7.5!
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2/29/08 at 8:16am
 butzie
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Because Algebra is about finding the unknown. The unknown is x.

You are not just doing arithmetic but solving for x. For example:
7x5 = 15 + 4x 5
7x  5 +5 = 15 + 4x
7x = 15 + 4x
7x  4x = 15
3x = 15
x = 5
Here is an example of imaginary numbers and how they are used in the real world. It is really somewhat technical. I liked the snow plow example. It is really used in real life in electrical engineering and physics.
http://mathforum.org/library/drmath/view/53606.html
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2/29/08 at 8:17am
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Love love love Math, but I have a BA in English.
I am really enjoying this thread.
I remember trying to figure something out in Neopets. I wanted to know how many neopoints (currency) I needed in my bank account in order to get 10,000 neopoints back in daily interest (the interest is listed as yearly). I got excited just because I knew I needed formulas.
I figured I needed around 26 million neopoints (I'm halfway there!) to get 10,000 back in interest.
I am really enjoying this thread.
I remember trying to figure something out in Neopets. I wanted to know how many neopoints (currency) I needed in my bank account in order to get 10,000 neopoints back in daily interest (the interest is listed as yearly). I got excited just because I knew I needed formulas.
I figured I needed around 26 million neopoints (I'm halfway there!) to get 10,000 back in interest.
post #27 of 47
2/29/08 at 9:12am
 fwan
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ERGGGGGGGGGGGGGGG Algebra was the worst math subject ever!!!!
want to know what my test score was in the end?
2%!!! i only had half a question right! and yes my teacher did give up on me after that score!
want to know what my test score was in the end?
2%!!! i only had half a question right! and yes my teacher did give up on me after that score!
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2/29/08 at 9:16am
 AlleyGirl
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This thread makes my head hurt.
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2/29/08 at 9:20am
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I have to say... I LOVE this thread! I'm a total math geek.
Amy, if you ever need in person help remember I'm only a 20minute drive away!
Amy, if you ever need in person help remember I'm only a 20minute drive away!
post #30 of 47
2/29/08 at 9:32am
 kluchetta
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Quote:
Well put! I aced calculus, so read on only if you'd like.
You are not just doing arithmetic but solving for x. For example: 7x5 = 15 + 4x 5 7x  5 +5 = 15 + 4x 7x = 15 + 4x 7x  4x = 15 3x = 15 x = 5 Here is an example of imaginary numbers and how they are used in the real world. It is really somewhat technical. I liked the snow plow example. It is really used in real life in electrical engineering and physics. http://mathforum.org/library/drmath/view/53606.html 
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