Question

x^2-7=-2
x^2-7+2=0
x1+x2=7
x1*x2=2
x3=
x4=

Answer 1

$x^{2}-7=-2\\\\x^{2}=-2+7\\\\x^{2}=5\\\\x_{1}=-\sqrt{5}\\\\x_{2}=\sqrt{5}\\\\Otvet:\boxed{-\sqrt{5} ;\sqrt{5}}$