Question

como fazer a equação no conjunto de r com x2-9x=0

Answer 1

$x^{2} -9x=0\to~~Por~~Evid\^encia:\\\\\\ x(x-9)=0\\\\\\ \boxed{x=0}\\\\ x-9=0\to~~\boxed{x=9}\\\\\\\\ \large\boxed{S=\{0;~9\}}$