9x^2-36=6x

Solution for 9x^2-36=6x equation:

9x^2-36=6x

We move all terms to the left:

9x^2-36-(6x)=0

a = 9; b = -6; c = -36;
Δ = b2-4ac
Δ = -62-4·9·(-36)
Δ = 1332
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:

$\sqrt{\Delta}=\sqrt{1332}=\sqrt{36*37}=\sqrt{36}*\sqrt{37}=6\sqrt{37}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-6\sqrt{37}}{2*9}=\frac{6-6\sqrt{37}}{18}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+6\sqrt{37}}{2*9}=\frac{6+6\sqrt{37}}{18}
$