x2-10x-11=5

Solution for x2-10x-11=5 equation:

x2-10x-11=5

We move all terms to the left:

x2-10x-11-(5)=0

We add all the numbers together, and all the variables

x^2-10x-16=0

a = 1; b = -10; c = -16;
Δ = b2-4ac
Δ = -102-4·1·(-16)
Δ = 164
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:

$\sqrt{\Delta}=\sqrt{164}=\sqrt{4*41}=\sqrt{4}*\sqrt{41}=2\sqrt{41}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10)-2\sqrt{41}}{2*1}=\frac{10-2\sqrt{41}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10)+2\sqrt{41}}{2*1}=\frac{10+2\sqrt{41}}{2}
$