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Help 15

NotSoSmart  Mar 5, 2018
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15)

\(\frac{\frac{n-4}{n^2-2n-15}}{\frac{n+1}{n+3}}\)

Simplify the polynomial.

\(\frac{\frac{n-4}{(n-5)(n+3)}}{\frac{n+1}{n+3}}\)

Multiply the top and the bottom fraction by the common equation, which is \((n-5)(n+3)\) .

\(\frac{n-4}{(n-5)(n+1)}\)

Choice 3

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16)

Take all the bottom numbers and make them equal to 0.

\(a^2-16=0, a-4=0, a+4=0\)

\(a^2=16, a=4, a=-4\)

\(a=4, a=4, a=-4\)

So that means \(a\) can NOT be 4 or -4.

Choose the option without those 2 numbers.

Choice 4.

CoopTheDupe  Mar 5, 2018

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