X(x-4)=192

Solution for X(x-4)=192 equation:

X(X-4)=192

We move all terms to the left:

X(X-4)-(192)=0

We multiply parentheses

X^2-4X-192=0

a = 1; b = -4; c = -192;
Δ = b2-4ac
Δ = -42-4·1·(-192)
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{-(-4)-28}{2*1}=\frac{-24}{2}
=-12
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+28}{2*1}=\frac{32}{2}
=16
$