Question

Given the function g÷x → [2x+1]

Answer 1

G : x → |2x + 1|
9^2 = (2x + 1)^2
81 = 4x^2 + 4x + 1
4x^2 + 4x + 1 - 81 = 0
(4x^2 + 4x - 80 = 0) ÷ 4
x^2 + x - 20 = 0
(x + 5)(x - 4) = 0
x = -5 dan x = 4

Answer 2

G(x) = |2x + 1|
    9 = |2x + 1|
   9² = (2x + 1)²
  81 = 4x² + 4x + 1
    0 = 4x² + 4x - 80
    0 = x² + x - 20
    0 = (x + 5)(x - 4)

x = -5    ∨    x = 4