Question

determine a raiz da equação 2x2-128=0

Answer 1

$2 x^{2} -128=0\\\\\\ 2 x^{2} =128\to \\\\ x^{2} = \frac{128}{2} \to \\\\ x^{2} =64\to \\\\ x= \pm \sqrt{64} \to \\\\ x=\pm 8\\\\\\ S=(-8;8)$

Espero que tenha ajudado...