Question

решите уравнение пжжж​

Answer 1

ОДЗ: 2-x≥0

2≥x

x∈(-∞;2]

2-x=81

x= -79

Answer 2

Ответ:

$\sqrt{2 - x} = 9 \\ 2 - x = 81 \\ - x = 81 - 2 \\ - x = 79 \\ x = - 79 \\ \sqrt{2 - ( - 79) } = 9 \\ 9 = 9 \\ x = - 79$