Resposta :
[tex]-2x^2+10=0 \\
\\
-2x^2=-10 \\
\\
x^2=\frac{-10}{-2} \\
\\
x^2=5 \\
\\
\boxed{x=+-\sqrt5}[/tex]
-2x² + 10 = 0
-2x² = -10
x² = -10 = 5
-2
x²= +- [tex] \sqrt{5} [/tex]
-2x² = -10
x² = -10 = 5
-2
x²= +- [tex] \sqrt{5} [/tex]