x^2+22x-13=0

Solution for x^2+22x-13=0 equation:

x^2+22x-13=0

a = 1; b = 22; c = -13;
Δ = b2-4ac
Δ = 222-4·1·(-13)
Δ = 536
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:

$\sqrt{\Delta}=\sqrt{536}=\sqrt{4*134}=\sqrt{4}*\sqrt{134}=2\sqrt{134}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(22)-2\sqrt{134}}{2*1}=\frac{-22-2\sqrt{134}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(22)+2\sqrt{134}}{2*1}=\frac{-22+2\sqrt{134}}{2}
$