0.13=x(x-1)

Solution for 0.13=x(x-1) equation:

0.13=x(x-1)

We move all terms to the left:

0.13-(x(x-1))=0


We calculate terms in parentheses: -(x(x-1)), so:

x(x-1)

We multiply parentheses

x^2-1x

Back to the equation:

-(x^2-1x)


We get rid of parentheses

-x^2+1x+0.13=0

We add all the numbers together, and all the variables

-1x^2+x+0.13=0

a = -1; b = 1; c = +0.13;
Δ = b2-4ac
Δ = 12-4·(-1)·0.13
Δ = 1.52
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-\sqrt{1.52}}{2*-1}=\frac{-1-\sqrt{1.52}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{1.52}}{2*-1}=\frac{-1+\sqrt{1.52}}{-2}
$