Question

-12±6 √5
/18
pf pf pf

Answer 1

           $\frac{-12+/-6 \sqrt{5} }{18} \\ \\ =\frac{6(-2+/- \sqrt{5}) }{18} \\ \\ = \frac{-2+/- \sqrt{5} }{3} \\ \\= \frac{-2- \sqrt{5} }{3} \\ \\ = \frac{-2+ \sqrt{5} }{3}$