Question

equacao 2 grau 4x=36

Answer 1

$4 x^{2} =36\\\\\\ x^{2} = \frac{36}{4} \to \\\\ x^{2} =9\to \\\\ x=\pm \sqrt{9} \to\\\\ x=\pm3\\\\\\ S=(-3;3)$

Espero ter ajudado...

Answer 2

$4 x^{2} = 36$ ⇒

$x^{2}$ = $\frac{36}{4}$ ⇒

$x^{2}$ = 9 ⇒

x = $\sqrt{|9|}$ ⇒

x = + 3