80=x(5-2x)

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Solution for 80=x(5-2x) equation: 



80=x(5-2x)

We move all terms to the left:

80-(x(5-2x))=0

We add all the numbers together, and all the variables

-(x(-2x+5))+80=0



We calculate terms in parentheses: -(x(-2x+5)), so:

x(-2x+5)

We multiply parentheses

-2x^2+5x

Back to the equation:

-(-2x^2+5x)



We get rid of parentheses

2x^2-5x+80=0

a = 2; b = -5; c = +80;
Δ = b2-4ac
Δ = -52-4·2·80
Δ = -615
Delta is less than zero, so there is no solution for the equation

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