Question

Lf f(x)=5x^3-2 and g(x)=x+1 find (f-g)(x)

A.5x^4-2
B.5x^3-x-1
C. 5x^3-x-3
D. 5x^3+1

Answer 1

`f(x)=5x^3-2\\\\g(x)=x+1\\\\(f-g)(x)=f(x)-g(x)=(5x^3-2)-(x+1)=5x^3-2-x-1=5x^3-x-3`

Answer: C. 5x^3 - x - 3