Question

Help Please :)
f(x) = 5x +7
and
g(x) = -2x - 4

f(g(x)) = -2x + ????

Answer 1

f(g(x)) = -10x - 13

???? = - 8x - 13

Explanation:

f(x) = 5x +7

and

g(x) = -2x - 4

f(g(x)) = f(-2x - 4) = 5(-2x - 4) + 7

f(g(x)) = -10x - 20 + 7

f(g(x)) = -10x - 13

f(g(x)) = -2x - 8x - 13

Answer 2

• f(g(x)) = - 10x - 13

Explanation:

Given functions:

• f(x) = 5x +7

and

• g(x) = -2x - 4

Work out the composite f(g(x)):

• f(g(x)) = f( -2x - 4) = 5( - 2x - 4) + 7 = -10x - 20 + 7 = - 10x - 13