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Can anyone please help me?PLEASE!

Can anyone please help me?PLEASE!-example-1

1 Answer

4 votes

Answer:


\large\boxed{D.\ -12x^2-3x+27}

Explanation:


f(x)=-9x^2-7x+12\\\\g(x)=3x^2-4x-15\\\\f(x)-g(x)=(-9x^2-7x+12)-(3x^2-4x-15)\\\\f(x)-g(x)=-9x^2-7x+12-3x^2-(-4x)-(-15)\\\\f(x)-g(x)=-9x^2-7x+12-3x^2+4x+15\\\\\text{combine like terms}\\\\f(x)-g(x)=(-9x^2-3x^2)+(-7x+4x)+(12+15)\\\\f(x)-g(x)=-12x^2-3x+27

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