Question

√x-7=4
решите пожалуйста уравнение

Answer 1

$sqrt{x } = 11 \ x = 121$

Answer 2

$sqrt{x - 7} = 4 \ ( sqrt{x - 7} ) {}^{2} = 4 {}^{2} \ sqrt{(x - 7) {}^{2} } = 16 \ x - 7 = 16 \ x = 16 + 7 \ x = 23$