Question

como resolve 5x²+7=2x²-5

Answer 1

$5 x^{2} +7=2 x^{2} -5$
$5 x^{2} +7-2 x^{2} +5=0$
$3 x^{2} +12=0$
$x^{2} = \frac{-12}{3}$
$x= \sqrt{-4}$