Question

реши квадратное уравнение х 2 = 7

Answer 1

x²=7

x=±√7

x1= √7, x2= -√7

Answer 2

x² = 7
x² + 0x + 0 = 7
x² + 0x - 7 = 0
D = b² - 4ac
D = 0 + 28 = 28
$x1,2 = \frac{ - b± \sqrt{D} }{2a}$
x1 = (0 - √28) ÷ 2 × 1 = -√7
x2 = (0 + √28) ÷ 2 × 1 = √7

Ответ: ±√7.