Friday
August 29, 2014

Homework Help: math check

Posted by Stacey on Sunday, April 25, 2010 at 7:22pm.

Simplify each rational expression.

3a(a-4)^2 over a^2(a-4) I don't understand how the answer would be 3(a-4) over a because the a-4 would cancel out???

4-y^2 over y^2-2y once I simplify I get (2-y)(2+y) over (y-2)(y+2) I don't understand how the answer is -(y+2) over y

9-r^2 over r^2-3 once I simplify i get (3-r)(3+r) over (r-3)(r+3) I dont understand how the answer is -(r+3) over r

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