Question

Let f(x) = -2x - 7 and g(x) = -4x + 3. Find (f o g)(-5)

A.
23

B.
3

C.
-9

D.
-53

Answer 1

You can do this 2 ways. Let x = -5, and solve for g, and put that number into f(x), or:

solve for f(x), letting x = g(x), then substituting x for -5

Answer 2

@johnweldon1993

Answer 3

write down the equation for f(x), but replace x with the equation of g(x).

f(x) = -2(g(x))-7
f(x) = -2(-4x+3)-7
simplify it, and then solve, letting x = -5

Answer 4

oh ok

Answer 5

B

Answer 6

@goformit100