Question

решите уравнение x^2+7=(х+7)^2

Answer 1

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