Homework Help: Algebra

Posted by Julie on Thursday, July 8, 2010 at 4:11am.

Divide the rational expression. Express the quotient as a rational expression in lowest terms.

(x^2+10x+21)/(x^2+11x+28) ÷ (x^2+3x)/(x^2+11x+28)

(i really need to know the steps on how to do this (please just don't give me the answer i already know it)

Algebra - drwls, Thursday, July 8, 2010 at 5:15am
Rewrite as a product by inverting the denomimator

[(x^2+10x+21)/(x^2+11x+28)] * [(x^2+11x+28)/(x^2+3x)/]

Cancel out the (x^2+11x+28)] terms which appear in both numerator and denominator.
(x^2+10x+21)/(x^2+3x)

Factor numerator and denomimator. Note that (x+3) is a factor of both. Cancel it out.
[(x+7)(x+3)]/[x*(x+3)]
(x+7)/x
Algebra - Julie, Thursday, July 8, 2010 at 5:39am
THANK YOU SO MUCH!!!! I KEPT TRYING TO DIVIDE EVERYTHING BY THE LCD BUT I JUST KEPT GETTING CONFUSED!

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