F(x)=7x+3 and g(x)=-6x-8, find (f•g)(x) and (f•g)(-1)

asked Aug 18, 2021 35.5k views

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Answer:

(f*g)(x)=-42x^2-74x-24

(f*g)(-1)=8

Explanation:

$f(x)=7x+3\\ g(x)=-6x-8$

$(f*g)(x)=(7x+3)(-6x-8)\\(f*g)(x)=-42x^2-56x-18x-24\\(f*g)(x)=-42x^2-74x-24$

Now;

$(f*g)(-1)=-42x^2-74x-24\\(f*g)(-1)=-42(-1)^2-74(-1)-24\\(f*g)(-1)=-42(1)+74-24\\(f*g)(-1)=-42+50\\(f*g)(-1)=8$

Chugreevd answered Aug 22, 2021

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