Question

If f(x) = 5x3 – 2 and g(x) = x+1, find (f - g)(x).

Answer 1

10

Explanation:

x=2

f(2)=5x3-2=15-2=13/2=6.5=f

g(2)=2+1=3/2=1.5=g

(6.5-1.5)(2)=(13-3)=10

Answer 2

5x³ - x - 3

Explanation:

(f - g)(x) = f(x) - g(x)

f(x) - g(x)

= 5x³ - 2 -(x + 1) = 5x³ - 2 - x - 1 = 5x³ - x - 3