Question

3x^2 - 2x - 1 = 0 ???

Answer 1

$\frac{ -(-2)+- \sqrt{2^{2}-4*3*(-1)}}{2*3}$ = 0
$\frac{2+- \sqrt{4+12} }{6}$ = 0
$\frac{2+- 4 }{6}$ = 0

$\left \{ {{x1=1} \atop {x2= \frac{-1}{3} }} \right.$