4x(x+5)=20x

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Solution for 4x(x+5)=20x equation: 



4x(x+5)=20x

We move all terms to the left:

4x(x+5)-(20x)=0

We add all the numbers together, and all the variables

-20x+4x(x+5)=0

We multiply parentheses

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

We add all the numbers together, and all the variables

4x^2=0

a = 4; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·4·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{0}{8}=0$

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