решите плиз : 2-7х ^2

Ответы:

x^2 + 7 = (х + 7)^2х ^2 + 7 = х ^2 + 14х + 49  х ^2 + 7 х ^2 14х 49 = 0-14х +7 49 = 0-14х 42 = 014х + 42 = 0 | :14х + 3 = 0х = -3