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Автор - rodionn767

реши квадратное уравнение х 2 = 7

Ответ

Проверено экспертом

Автор - Evgenia4836

x²=7

x=±√7

x1= √7, x2= -√7

Ответ

Автор - VelPhillips
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.

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