x(x-1)=480

Solution for x(x-1)=480 equation:

x(x-1)=480

We move all terms to the left:

x(x-1)-(480)=0

We multiply parentheses

x^2-1x-480=0

a = 1; b = -1; c = -480;
Δ = b2-4ac
Δ = -12-4·1·(-480)
Δ = 1921
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{1921}}{2*1}=\frac{1-\sqrt{1921}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{1921}}{2*1}=\frac{1+\sqrt{1921}}{2}
$