Verified answer

Ответ:

2х2 - 4х = х2 +2х + 1 - 9

х2 - 6х + 8 =0

D = b2 - 4ac = 36- 32 = 4

[tex] \sqrt{4} = 2[/tex]

D>0 => 2 корня

Х1 = - b + 2 /2a = 6+2 /2 = 4

X2 = - b - 2 /2a = 6-2 /2 = 2

Ответ

Х1 =4

Х2 = 2

Ответ:

x = 2; x = 4

Объяснение:

2х(х-2) = (х+1)^2 - 9

2х^2 - 4x = x^2 + 2x + 1 - 9

2x^2 - 4x - x^2 - 2x - 1 + 9 = 0

x^2 - 6x + 8 = 0

D = b^2 - 4ac = 36 - 4*1*8 = 36 - 32 = 4

x1 = (-b + \/D) : 2a = (6+2) : 2 = 4

x2 = (-b - \/D) : 2a = (6-2) : 2 = 2