Найдите дискриминант: x^2 + 15x + 56 = 0

Д= 225 - 4*56= 225-224= 1

[latex]x = - 15 + - \sqrt{ 15^{2} - 4 * 1 * 56 } x = - 15 + - \sqrt{225-224} x = - 15 + - \sqrt{1} x = - 15 + - 1 x1 = 7 x2 = -8[/latex]