Question

!!!!!!!!СРОЧНО!!!!!!!!! Квадратное уравнение

Answer 1

x^2 + 6x + 8 = 0Выделим полный квадрат:x^2 + 6x + 9 - 1 = 0(x + 3)^2 - 1 = 0(x + 4)(x + 2) = 0x = -4x = -2

Answer 2

$x^2+6x+8=0 \\ D= \sqrt{b^2-4ac} = \sqrt{6^2-4*1*8} = \sqrt{36-32} = \sqrt{4} =б2 \\ \\ x_1= \frac{-b+ \sqrt{D} }{2a} = \frac{-6+2}{2} = \frac{-4}{2} =-2 \\ \\ x_2= \frac{-b-\sqrt{D} }{2a} = \frac{-6-2}{2} = \frac{-8}{2} =-4$