If f(x)=2x and g(x)=x^2-1 which statement is true? a. (f*g)(x)=2x^2 -1 b.(f*g)(x)=2x(x^2-1) c.(g*f)(x)=4x-1 d.(g*f)(x)=4x^2-1

For this case, the first thing we must do is multiply both functions to obtain the desired result.
 We have then:
 f (x) = 2x
 g (x) = x ^ 2-1
 Multiplying we have:
 (f * g) (x) = (2x) * (x ^ 2-1)
 
 The following statement is correct:
 B. (f * g) (x) = 2x (x ^ 2-1)

The second and fourth answer are correct