Question

X ao quadrado = X+12.

Answer 1

x² = x + 12
x² - x - 12 = 0

Δ = b²−4ac
Δ = (−1)²−4⋅1⋅−12
Δ = 1 + 48
Δ = 49

$x = \dfrac{-b \pm \sqrt{\Delta}}{2*a}\\ \\ \\x = \dfrac{-(-1) \pm \sqrt{49}}{2*1}\\ \\ \\x = \dfrac{1 \pm 7}{2}\\ \\ \\x' = \dfrac{1 + 7}{2}\\ \\ \\x' = \dfrac{8}{2}\\ \\ \\x' = 4\\ \\ \\x'' = \dfrac{1 - 7}{2}\\ \\ \\x'' = \dfrac{-6}{2}\\ \\ \\x'' = -3$


S = {4, -3}