Question

If c(x)=4x-2 and d(x)= x^2+5x what is (c*d)(x)

Answer 1

$c(x)=4x-2\\d(x)=x^2+5x\\\\(c\times d)(x)\\=(4x-2)(x^2+5x)(x)\\=4x^3+20x^2-2x^2-10x(x)\\=4x^3+18x^2-10(x)$

If I understood correctly

Answer 2

(c*d)(x)=(4x-2)(x²+5x)=4x³-2x²+20x²-10x=4x³+18x²-10x