Answer:
x = 2
Step-by-step explanation:
x² + 12 = 8x ( subtract 8x from both sides )
x² - 8x + 12 = 0 ← in standard form
(x - 2)(x - 6) = 0 ← in factored form
Equate each factor to zero and solve for x
x - 2 = 0 ⇒ x = 2
x - 6 = 0 ⇒ x = 6
Given that the solution has to ∈ { 2, 4, 5, 8 } , then
solution is x = 2
