Question

-x*-2x=1 , o x é elevado a 2

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!