72=x(24-2x)

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Solution for 72=x(24-2x) equation: 



72=x(24-2x)

We move all terms to the left:

72-(x(24-2x))=0

We add all the numbers together, and all the variables

-(x(-2x+24))+72=0



We calculate terms in parentheses: -(x(-2x+24)), so:

x(-2x+24)

We multiply parentheses

-2x^2+24x

Back to the equation:

-(-2x^2+24x)



We get rid of parentheses

2x^2-24x+72=0

a = 2; b = -24; c = +72;
Δ = b2-4ac
Δ = -242-4·2·72
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{24}{4}=6$

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