9x2=30

Solution for 9x2=30 equation:

9x^2=30

We move all terms to the left:

9x^2-(30)=0

a = 9; b = 0; c = -30;
Δ = b2-4ac
Δ = 02-4·9·(-30)
Δ = 1080
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{1080}=\sqrt{36*30}=\sqrt{36}*\sqrt{30}=6\sqrt{30}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-6\sqrt{30}}{2*9}=\frac{0-6\sqrt{30}}{18}
=-\frac{6\sqrt{30}}{18}
=-\frac{\sqrt{30}}{3}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+6\sqrt{30}}{2*9}=\frac{0+6\sqrt{30}}{18}
=\frac{6\sqrt{30}}{18}
=\frac{\sqrt{30}}{3}
$