Question

Se f(x)=5x+7 e g(x)=2x-2, então f(g(x)) é:

a) f(g(x))=10x-3
b) f(g(x))=10x-13
c) f(g(x))=10x+3
d) f(g(x))=7x-3
e) f(g(x))=7x+1

Answer 1

Resposta:

a) f(g(x))=10x-3

Explicação passo-a-passo:

f(x) = 5x + 7

g(x) = 2x - 2

f(g(x)) = ?

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

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

f(2x - 2) = 10x + (-10) + 7

f(2x - 2) = 10x - 10 + 7

f(2x - 2) = 10x - 3