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Simplify \(\large \dfrac{x^2+x-12}{-x^2-4x+21} \div \dfrac{x+4}{x+7}\)

 Jun 18, 2020
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First, we have to apply the fraction rule, turning it into (x2+x-12)/(-x2-3x+21)(x+7)/(x+4)

 

We simplify it to be -(x+4)/(x+7)(x+7)/(x+4)

 

We multiply it to -(x+7)/(x+7)

 

Simplify that to be -1

 

Yay!

 Jun 18, 2020

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