f(x)=x^2-3 and g(x)=4x+1 to

Question

Evaluate (f-g)(-3)

Then find (fg)(x)

Thanks a million

Answer 1

(fg)(x) = f(x)*g(x) = (x^2-3)(4x+1) = 4x^3 + x^2 - 12x - 3

(f-g)(-3) = f(-3)-g(-3) = 6-(-11) = 17