4x(5-x)=25

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Solution for 4x(5-x)=25 equation: 



4x(5-x)=25

We move all terms to the left:

4x(5-x)-(25)=0

We add all the numbers together, and all the variables

4x(-1x+5)-25=0

We multiply parentheses

-4x^2+20x-25=0

a = -4; b = 20; c = -25;
Δ = b2-4ac
Δ = 202-4·(-4)·(-25)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-20}{-8}=2+1/2$

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