Distributing negatives

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October 28th 2008, 06:05 PM
realintegerz

Distributing negatives

I've had problems with this for a while now...can someone please explain?

http://i218.photobucket.com/albums/c...ad47/1-1-1.jpg

http://i218.photobucket.com/albums/c...ad47/2-1-1.jpg

http://i218.photobucket.com/albums/cc115/ahad47/3-1.jpg
October 29th 2008, 09:04 AM
masters

There are a number of ways you can distribute a negative over a rational expression. Here are a few of them.

$-\left(\frac{x^3-3}{x^2+1}\right)=\frac{-(x^3-3)}{x^2+1}=\frac{-x^3+3}{x^2+1}=\frac{3-x^3}{x^2+1}$

$-\left(\frac{x^3-3}{x^2+1}\right)=\frac{x^3-3}{-(x^2+1)}=\frac{x^3-3}{-x^2-1}$

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