Question

f(x) = 3x - 9; g(x) = x-4 , what is the value of ( g * f ) (5)?

Answer 1

g(5)*f(5)

Answer 2

6*1
=6

Answer 3

\[f(x)=3x-9\]
\[g(x)=x-4 \]
\[f(x)*g(x)=(3x-9)(x-4)\]
\[(f*g)(5)=(15-9)(5-4)\]
\[(f*g)(5)=6*1\]

Answer 4

first...find f(x) x g(x)

(3x - 9)(x-4)
3x^2 -21x + 36

substitute by 5
75 - 105 + 36
=6