Question

9. Dadas as funções f(x) = 4x -1 e g(x) = 3x + 3, determine o valor de x para f(x)
= g(x). o qual g(x) = -2:

Answer 1

f(x)= g(x)
4x-1=3(-2)+3
4x-1=-6+3⇒4x-1=-3⇒4x=-3+1⇒4x=-2⇒$x= \frac{-2}{4} = \frac{-1}{2}$

Answer 2

f(x) = g(x)
4x-1 = 3x+3
4x-3x = 3+1
x = 4

g(x) = -2
3x+3 = -2
3x = -2-3
3x = -5
x = -5/3
Verficando:
g(-5/3) = -2
3.(-5/3) +3 = -2
-15/3 + 3 = -2
-5 + 3 = -2
-2 = -2 (V)
Logo, x = -5/3