- Let f(x)=8x-7 and g(x)=8x+8. Find (f*g)(7)
f*g = (8x – 7)*(8x + 8) = 64x^2 + 8x – 56
f*g(7) = 64(7)^2 + 8(7) – 56
f*g(7) = 64*49 + 56 – 56
f*g(7) = 3136
2. Let f(x)=4-x^2 and g(x)=2-x. Find f(x)*g(x)
f(x) = 4 – x^2
g(x) = 2 – x
f(x)*g(x) = (4 – x^2)*(2 – x)
f(x)*g(x) = 8 – 2x^2 – 4x + x^3
f(x)*g(x) = x^3 – 2x^2 – 4x + 8