Question

como resolver essa equação
$x(x-1)=x(2x-1)-18$

Answer 1

$x(x-1) = x(2x-1)-18\\\\ x^2-x = 2x^2-x-18\\\\ x^2-18=0\\\\ x^2=18\\\\ x = \sqrt{18}\\\\ \boxed{x=+\ ou\ -\ 3\sqrt{2}}$