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Math help please
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Dreamer567 Offline
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Post: #1
Math help please

Ughh another school year and the unpleasant burn of fiery hatred for math has come again. Joy... Can someone please walk me through how to factor these problems? (btw the threes in number two are supposed to mean cubed, I don't know how to type that on here) Much appreciated. :-)

1) 5x(x+3)-4(x+3)

2)x3-125y3

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09-02-2009 11:39 AM
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IllusoryDeath Away
~become away~

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Post: #2
Re: Math help please

The overall subject of math brings out a loathing in me so fierce that I could make bunnies explode simply by glaring at them.

'nuff said.

Anyway, I do not have the time tonight to help with the equations themselves, but to make a number squared or cubed or anything higher by using your keyboard, you just use the ^ key located on the top number palate. For example: 5 cubed is 5^3
09-02-2009 11:59 AM
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magikarp Offline
Valerie Solanas

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Post: #3
Re: Math help please

1)

5x(x + 3) - 4(x + 3)
=(x + 3)(5x - 4)

You just factor out the common factor (x + 3) there.

2) http://www.purplemath.com/modules/specfact2.htm

x^3 - 125y^3
=x^3 - 5^3y^3
=x^3 - (5y)^3
=(x - 5y)(x^2 + 5xy + (5y)^2)
=(x - 5y)(x^2 + 5xy + 25y^2)

I don't really know how to explain better, though. D:

"Do we treat straight public sex differently than we do gay public sex? Of course. Straight people are so proud of their public sex that they named a cocktail after it."
09-02-2009 12:17 PM
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Bob Dole Offline
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Post: #4
Re: Math help please

1) 5x(x+3)-4(x+3)

5x^2+15x-4x-12
5x^2+11x-12

2)x^3-125y^3 (This one's a doozy.)
(x - 5y)(x^2 + 5xy + 25y^2)

Difference of cubes is a pain in the ass, I always get it mixed up with the sum of cubes for some reason.

K
S
09-02-2009 12:21 PM
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Dreamer567 Offline
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Post: #5
Re: Math help please

Thanks everyone! :-)

www.screamfreedom.webs.com Check it out
09-02-2009 08:05 PM
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