Question

resolva a equação irracional √x² 3x-9 = x

Answer 1

$\sqrt{x^2+3x-9} =x\\\\\\ (\sqrt{x^2+3x-9} )^2=( x)^{2} \\ \\x^2+3x-9= x^{2} \to\\\\ x^2+3x-9- x^{2} =0\to \\\\ 3x-9=0\to\\\\ 3x=9\to\\\\ x= \frac{9}{3} \to \\\\x=3$