Question

quero saber qual o resutado de 7x² x 2=0

Answer 1

Coloque o 'x' em evidência:

$7 x^{2} +2x=0\\\\ x(7x+2)=0\\\\ x=0\\\\ 7x+2=0\to 7x=-2\to x=- \frac{2}{7} \\\\\\ S=(- \frac{2}{7};0)$