Question

Find (fg)(x) for: f(x) = (x + 16) x ; g(x) = (2x) (x + 4)

Answer 1

basically multiply f(x) and g(x)

(fg)(x)=(x+16)(x)(2x)(x+4)=
(x²+16x)(2x²+8x)=
2x⁴+32x³+8x³+128x²=
2x⁴+40x³+128x²=(fg)(x)