Question

Podem me ajudar nessa
-2x² + 4x +12

Answer 1

$x = \frac{2 + ou - \sqrt{28} }{2}$
$\sqrt{28} = \sqrt{2 {}^{2} \times 7}$
$\sqrt{2 {}^{2} } \times \sqrt{7}$
$2 \times \sqrt{7} = 2 \sqrt{7}$