0.211=x(1-x)

Solution for 0.211=x(1-x) equation:

0.211=x(1-x)

We move all terms to the left:

0.211-(x(1-x))=0

We add all the numbers together, and all the variables

-(x(-1x+1))+0.211=0


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

x(-1x+1)

We multiply parentheses

-1x^2+x

Back to the equation:

-(-1x^2+x)


We get rid of parentheses

1x^2-x+0.211=0

We add all the numbers together, and all the variables

x^2-1x+0.211=0

a = 1; b = -1; c = +0.211;
Δ = b2-4ac
Δ = -12-4·1·0.211
Δ = 0.156
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{0.156}}{2*1}=\frac{1-\sqrt{0.156}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{0.156}}{2*1}=\frac{1+\sqrt{0.156}}{2}
$