Respostas

2013-10-30T15:53:59-02:00
(2x - 1)² = -2 -x²
4x^2 - 4x + 1 = -2 -x^2
4x^2 + x^2 -4x +1 + 2= 0
5x^2 -4x + 3 = 0
delta = b^2 - 4.a.c
delta = (-4)^2 - 4. 5 . 3
delta = 16 - 60
delta = -44