Question

Помогите пожалуйста:(
$x^{2} -7=0$

Answer 1

x² - 7 = 0
x² - (√7)² = 0
(x - √7)(x + √7) = 0
или  x - √7 = 0                   или   x + √7 = 0
        x₁ = √7                                x₂ = - √7
Ответ: - √7 ; √7

Answer 2

${x}^{2} - 7 = 0 \\ {x}^{2} = 7 \\ x = \pm \sqrt{7}$