x^2 = -10x - 21
x^2 + 10x + 21 = 0
x^2 + 3x + 7x + 21 = 0
x(x + 3) + 7(x + 3) = 0
(x + 3)(x + 7) = 0
x = -3; x = -7
Ответ: x = -3; x = -7
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x^2 = -10x - 21
x^2 + 10x + 21 = 0
x^2 + 3x + 7x + 21 = 0
x(x + 3) + 7(x + 3) = 0
(x + 3)(x + 7) = 0
x = -3; x = -7
Ответ: x = -3; x = -7