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