Question

Решите уравнение x^2=2x+8

Answer 1

Х^2 -2х-8 =0

Решаем через дискриминант:

Д= 4-4*(-8) =36 = 6^2

Х1 =( 2-6):2= -2

Х2 = (2+6) :2 = 4

Answer 2

$x {}^{2} = 2x + 8 \\ x {}^{2} - 2x - 8 = 0 \\ d = \sqrt{36} = 6 \\ x1 = \frac{2 + 6}{2} = 4 \\ x2 = \frac{2 - 6}{2} = - 2$