x2-16x-100=0

Solution for x2-16x-100=0 equation:

x2-16x-100=0

We add all the numbers together, and all the variables

x^2-16x-100=0

a = 1; b = -16; c = -100;
Δ = b2-4ac
Δ = -162-4·1·(-100)
Δ = 656
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:

$\sqrt{\Delta}=\sqrt{656}=\sqrt{16*41}=\sqrt{16}*\sqrt{41}=4\sqrt{41}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-16)-4\sqrt{41}}{2*1}=\frac{16-4\sqrt{41}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-16)+4\sqrt{41}}{2*1}=\frac{16+4\sqrt{41}}{2}
$