x^2-30x-500=0

Solution for x^2-30x-500=0 equation:

x^2-30x-500=0

a = 1; b = -30; c = -500;
Δ = b2-4ac
Δ = -302-4·1·(-500)
Δ = 2900
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:

$\sqrt{\Delta}=\sqrt{2900}=\sqrt{100*29}=\sqrt{100}*\sqrt{29}=10\sqrt{29}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-10\sqrt{29}}{2*1}=\frac{30-10\sqrt{29}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+10\sqrt{29}}{2*1}=\frac{30+10\sqrt{29}}{2}
$