Question

X ao quadrado = x+12

Answer 1

Vejamos: x^2 = x + 12 x^2 - x - 12 = 0 a = 1 b = -1 c = -12 ∆ = b^2 - 4ac ∆ = (-1)^2 - 4.1.(-12) ∆ = 1 + 48 ∆ = 49 x = (-b +-√∆)/2a x = (1 +-√49)/2.1 x = (1 +- 7)/2 x' = (1 + 7)/2 = 8/2 = 4 x'' = (1 - 7)/2 = -6/2 = -3 S = {4, -3}