Question

-x^2+2х+3 
Нужны корни .Любым способом.

Answer 1

x^2 - 2x - 3 = 0
D = 4 - 4 * 1 * (-3) = 4 + 12 = 16.
x1,2 = (2 +/- 4)/2.
x1 = 3; x2 = -1.
Ответ: x1 = 3; x2 = -1.

Answer 2

-х•2+2х+3
-х•2-2х+3
-х=(2+2)+3
Х=-7