x(x-5)=369,-4

Solution for x(x-5)=369,-4 equation:

x(x-5)=369.-4

We move all terms to the left:

x(x-5)-(369.-4)=0

We add all the numbers together, and all the variables

x(x-5)-365=0

We multiply parentheses

x^2-5x-365=0

a = 1; b = -5; c = -365;
Δ = b2-4ac
Δ = -52-4·1·(-365)
Δ = 1485
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:

$\sqrt{\Delta}=\sqrt{1485}=\sqrt{9*165}=\sqrt{9}*\sqrt{165}=3\sqrt{165}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-5)-3\sqrt{165}}{2*1}=\frac{5-3\sqrt{165}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+3\sqrt{165}}{2*1}=\frac{5+3\sqrt{165}}{2}
$