Question

Suppose that the functions f and g are defined for all real numbers x as follows.
f(x)=x^3
g(x)=4x^2.
Write the expressions for (f*g)(x) and(f+g)(x) and evaluate (f-g)(-1)

Answer 1

@tkhunny @dan815

Answer 2

These are just notation exercises. There is only learning what the notation means.

(f*g)(x) = f(x) * g(x)
(f+g)(x) = f(x) + g(x)
(f-g)(-1) = f(x) - g(x)

Build those and substitute any values shown.