x2+16x+20=0

Solution for x2+16x+20=0 equation:

x2+16x+20=0

We add all the numbers together, and all the variables

x^2+16x+20=0

a = 1; b = 16; c = +20;
Δ = b2-4ac
Δ = 162-4·1·20
Δ = 176
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:

$\sqrt{\Delta}=\sqrt{176}=\sqrt{16*11}=\sqrt{16}*\sqrt{11}=4\sqrt{11}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(16)-4\sqrt{11}}{2*1}=\frac{-16-4\sqrt{11}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(16)+4\sqrt{11}}{2*1}=\frac{-16+4\sqrt{11}}{2}
$