x*x+x=360

Solution for x*x+x=360 equation:

x*x+x=360

We move all terms to the left:

x*x+x-(360)=0

We add all the numbers together, and all the variables

x+x*x-360=0

Wy multiply elements

x^2+x-360=0

a = 1; b = 1; c = -360;
Δ = b2-4ac
Δ = 12-4·1·(-360)
Δ = 1441
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-\sqrt{1441}}{2*1}=\frac{-1-\sqrt{1441}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{1441}}{2*1}=\frac{-1+\sqrt{1441}}{2}
$