Question

Calcule esse número: x²-2x= -1

Answer 1

x² - 2x = -1
x² - 2x + 1 = 0

a = 1; b = -2; c = 1

x = [- b ± √(b² - 4ac)] / 2a
x = [- (-2) ± √([-2]² - 4 . 1 . 1)] / 2 . 1
x = [2 ± √(4 - 4)] / 2
x = [2 ± √0] / 2
x = [2 ± 0] / 2
x' = [2 - 0] / 2 = 2 / 2 = 1
x'' = [2 + 0] / 2 = 2 / 2 = 1

S = {1}

Espero ter ajudado. Valeu!