2(a-2)-2a(a-3)=4

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Solution for 2(a-2)-2a(a-3)=4 equation: 



2(a-2)-2a(a-3)=4

We move all terms to the left:

2(a-2)-2a(a-3)-(4)=0

We multiply parentheses

-2a^2+2a+6a-4-4=0

We add all the numbers together, and all the variables

-2a^2+8a-8=0

a = -2; b = 8; c = -8;
Δ = b2-4ac
Δ = 82-4·(-2)·(-8)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$a=\frac{-b}{2a}=\frac{-8}{-4}=+2$

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