108=x(x-12)

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Solution for 108=x(x-12) equation:



108=x(x-12)
We move all terms to the left:
108-(x(x-12))=0
We calculate terms in parentheses: -(x(x-12)), so:
x(x-12)
We multiply parentheses
x^2-12x
Back to the equation:
-(x^2-12x)
We get rid of parentheses
-x^2+12x+108=0
We add all the numbers together, and all the variables
-1x^2+12x+108=0
a = -1; b = 12; c = +108;
Δ = b2-4ac
Δ = 122-4·(-1)·108
Δ = 576
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{576}=24$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(12)-24}{2*-1}=\frac{-36}{-2} =+18 $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(12)+24}{2*-1}=\frac{12}{-2} =-6 $

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