x(2+x)-2(3x-4)=4

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Solution for x(2+x)-2(3x-4)=4 equation: 



x(2+x)-2(3x-4)=4

We move all terms to the left:

x(2+x)-2(3x-4)-(4)=0

We add all the numbers together, and all the variables

x(x+2)-2(3x-4)-4=0

We multiply parentheses

x^2+2x-6x+8-4=0

We add all the numbers together, and all the variables

x^2-4x+4=0

a = 1; b = -4; c = +4;
Δ = b2-4ac
Δ = -42-4·1·4
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

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

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