x^2+36x-216=0

Solution for x^2+36x-216=0 equation:

x^2+36x-216=0

a = 1; b = 36; c = -216;
Δ = b2-4ac
Δ = 362-4·1·(-216)
Δ = 2160
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:

$\sqrt{\Delta}=\sqrt{2160}=\sqrt{144*15}=\sqrt{144}*\sqrt{15}=12\sqrt{15}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(36)-12\sqrt{15}}{2*1}=\frac{-36-12\sqrt{15}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(36)+12\sqrt{15}}{2*1}=\frac{-36+12\sqrt{15}}{2}
$