Question

Решите уравнение x = sqrt(2-2x-4)

Answer 1

$x= \sqrt{2-2x-4}$
$x= \sqrt{-2x-2}$ | в квадрат
$\left \{ {{x^2=-2x-2} \atop {-2x-2 \geq 0 }} \right.$
$\left \{ {{x^2+2x+2=0} \atop {-x-1 \geq 0}} \right.$
$1) x^2+2x+2=0$
$\frac{D}{4} =1-2\ \textless \ 0$
$x$∈∅