Question

3x^2-28=0

Answer 1

Could complete the square, or use the quadratic formula without too much trouble. Might also factor\[3x^2-28=0\implies x^2-28/3=0\implies (x+\sqrt{\frac{28}{3}})(x-\sqrt{\frac{28}{3}})=0\]

Answer 2

So, \[x=\pm \sqrt{\frac{28}{3}}\]

Answer 3

Actually, that solution could be put into a simpler form.....\[x=\pm 2\frac{\sqrt{21}}{3}\]