Question

For f(x)=2x+1 and g(x)=x^2-7, find (f-g)(x)

a. x^2-2x-8
b. -x^2+2x+8
c. 2x^2-15
d. -x^2+2x-6

Answer 1

-x^2 +2x +8

Explanation:

for f(x)=2x+1 and g(x)=x^2-7,

(f-g)(x) = 2x+1 -(x^2-7)

Distribute the minus sign

= 2x+1 -x^2 +7

= -x^2 +2x +8