Question

-2x elevado a 2 + 7 =0

Answer 1

-2x² + 7 = 0
-2x² = -7
2x² = 7 
x² = $\frac{7}{2}$
$\sqrt{ x^{2} }$ = $\sqrt{ \frac{7}{2} }$
x = $\frac{+}{-} \frac{7}{2}$

Logo, x = $\frac{7}{2}$ e x = $\frac{-7}{2}$