Question

Let f(x) = -2x - 7 and g(x) = -4x + 6. Find (f o g)(-5)

A. –6
B. 3
C. 26
D. –59

Answer 1

the answer is -6 .so the (f o g) is -6

Answer 2

(f o g)(x) means f(g(x))
one way to find (f o g)(-5) is to find the value of g(-5) then subsitute that for x in f(x)

so
g(5)=-4(-5)+6
g(5)=20+6
g(5)=26

f(g(5))=f(26)=-2(26)-7
f(g(5))=-52-7
f(g(5))=-59

answer is D