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Gamefly PC beta key (Math quiz, fairly easy) - Page 2

post #11 of 27
Thread Starter 
Quote:
Originally Posted by csm725 View Post

1) x^3-512
2) x^2+16
3) x^4-625
#2 is NOT factorable.
1) x^3 - 512 =
(x-8)(x^2+8) = //the difference of two cubes (X^3-Y^3) factors into (X-Y)(X^2+XY+Y^2)
(x-8)(x^2+8x+64) //perfect square (a^2+b^2) = a^2+2ab+b^2
3) x^4-625=
(x^2+25)(x^2-25) = //(a^2-b^2) = (a+b)(a-b)
(x^2+25)(x+5)(x-5) //see above

And we have a winner!

PMing code as we speak.
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post #12 of 27
technically i am correct because i forced the factor. but o well. it really wasnt that hard...
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post #13 of 27
Thread Starter 
Quote:
Originally Posted by ikem View Post

technically i am correct because i forced the factor. but o well. it really wasnt that hard...

Disregarding your use of imaginary numbers which I said were not needed.

Your first answer was not factored completely.

8 can be broken down to the cubed root of 2.
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post #14 of 27
maths=pain

anyone who wants a beta key can pm me. only have 1 extra.
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post #15 of 27
Quote:
Originally Posted by Bobicon View Post

Disregarding your use of imaginary numbers which I said were not needed.
Your first answer was not factored completely.
8 can be broken down to the cubed root of 2.

what?

yes 8 can be broken down but not to the cubed root of 2....

2^3=8

also you cant factor it out because x is in there also.

please explain how u get that it isnt factored completely.
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post #16 of 27
Thread Starter 
Quote:
Originally Posted by ikem View Post

what?
yes 8 can be broken down but not to the cubed root of 2....
2^3=8
also you cant factor it out because x is in there also.
please explain how u get that it isnt factored completely.

Disregard what I stated about being able to break it down again considering 8 is the cubed root of 512. I have no idea why I stated to break it down again, but the main reason why you answer isn't fully accepted as a correct answer in my book is because you used imaginary numbers in all of your answers when you could have solved them all without the use of them which makes your answers ultimately inclusiveness because you can solve them completely with the use of real numbers.

I should also mention that in the OP I stated not to use imaginary numbers.
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post #17 of 27
what does "^" mean?
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post #18 of 27
To the power of.
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post #19 of 27
thats what I thought, but I had to confirm smile.gif. I'm no good with the maths.

now to remember what a power is D:
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post #20 of 27
x^y = x times itself y times
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