(x+3)^2=5x+15 решите уравнение.Пожалуйста.
X^2 + 6x + 9 = 5x + 15 x^2 + 6x - 5x + 9 - 15 = 0 x^2 + x - 6 = 0 D = 1 + 4*6 = 25 x1 = ( - 1 + 5)/2 = 4/2 = 2; x2 = ( - 1 - 5)/2 = - 6/2 = - 3