x(x-12)=-25

Solution for x(x-12)=-25 equation:

x(x-12)=-25

We move all terms to the left:

x(x-12)-(-25)=0

We add all the numbers together, and all the variables

x(x-12)+25=0

We multiply parentheses

x^2-12x+25=0

a = 1; b = -12; c = +25;
Δ = b2-4ac
Δ = -122-4·1·25
Δ = 44
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:

$\sqrt{\Delta}=\sqrt{44}=\sqrt{4*11}=\sqrt{4}*\sqrt{11}=2\sqrt{11}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-12)-2\sqrt{11}}{2*1}=\frac{12-2\sqrt{11}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-12)+2\sqrt{11}}{2*1}=\frac{12+2\sqrt{11}}{2}
$