Question

√x-7=4
решите пожалуйста уравнение

Answer 1

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

Answer 2

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