Question

f(x)=6x+8 e g(x)=2x-4 o valor de fog(3) e: a)1 b)26 c)12 d)20 e)16

Answer 1

f(x) = 6x + 8

g(x) = 2x - 4

f o g = 6.(2x - 4) + 8
f o g = 12x - 24 + 8
f o g = 12x - 16

x = 3

f o g (3)= 12.3 - 16
f o g (3) = 36 - 16 = 20  (letra D)