50=x(20-2x)

Solution for 50=x(20-2x) equation:

50=x(20-2x)

We move all terms to the left:

50-(x(20-2x))=0

We add all the numbers together, and all the variables

-(x(-2x+20))+50=0


We calculate terms in parentheses: -(x(-2x+20)), so:

x(-2x+20)

We multiply parentheses

-2x^2+20x

Back to the equation:

-(-2x^2+20x)


We get rid of parentheses

2x^2-20x+50=0

a = 2; b = -20; c = +50;
Δ = b2-4ac
Δ = -202-4·2·50
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{20}{4}=5$