Question

quanto é ✓198-✓18x=12

Answer 1

Está no anexo que coloquei.

Answer 2

$\sf \sqrt{198}-\sqrt{18}x=12\\\\\\3\sqrt{22}-3\sqrt{2}x=1\\\\\\\\3\sqrt{22}-3\sqrt{2}x-3\sqrt{22}=12-3\sqrt{22}\\\\\\-3\sqrt{2}x=12-3\sqrt{22}\\\\\\\dfrac{-3\sqrt{2}x}{-3\sqrt{2}}=\dfrac{12}{-3\sqrt{2}}-\dfrac{3\sqrt{22}}{-3\sqrt{2}}\\\\\\\to \boxed{\sf x=\sqrt{11}-2\sqrt{2}}$