x^2+8x+20x=0

Solution for x^2+8x+20x=0 equation:

x^2+8x+20x=0

We add all the numbers together, and all the variables

x^2+28x=0

a = 1; b = 28; c = 0;
Δ = b2-4ac
Δ = 282-4·1·0
Δ = 784
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{784}=28$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(28)-28}{2*1}=\frac{-56}{2}
=-28
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(28)+28}{2*1}=\frac{0}{2}
=0
$