x(x+4)=960

Solution for x(x+4)=960 equation:

x(x+4)=960

We move all terms to the left:

x(x+4)-(960)=0

We multiply parentheses

x^2+4x-960=0

a = 1; b = 4; c = -960;
Δ = b2-4ac
Δ = 42-4·1·(-960)
Δ = 3856
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:

$\sqrt{\Delta}=\sqrt{3856}=\sqrt{16*241}=\sqrt{16}*\sqrt{241}=4\sqrt{241}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-4\sqrt{241}}{2*1}=\frac{-4-4\sqrt{241}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+4\sqrt{241}}{2*1}=\frac{-4+4\sqrt{241}}{2}
$