x2-30x-264=0

Solution for x2-30x-264=0 equation:

x2-30x-264=0

We add all the numbers together, and all the variables

x^2-30x-264=0

a = 1; b = -30; c = -264;
Δ = b2-4ac
Δ = -302-4·1·(-264)
Δ = 1956
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:

$\sqrt{\Delta}=\sqrt{1956}=\sqrt{4*489}=\sqrt{4}*\sqrt{489}=2\sqrt{489}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-2\sqrt{489}}{2*1}=\frac{30-2\sqrt{489}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+2\sqrt{489}}{2*1}=\frac{30+2\sqrt{489}}{2}
$