(12-a)*(12-a)=0

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Solution for (12-a)*(12-a)=0 equation: 



(12-a)(12-a)=0

We add all the numbers together, and all the variables

(-1a+12)(-1a+12)=0

We multiply parentheses ..

(+a^2-12a-12a+144)=0

We get rid of parentheses

a^2-12a-12a+144=0

We add all the numbers together, and all the variables

a^2-24a+144=0

a = 1; b = -24; c = +144;
Δ = b2-4ac
Δ = -242-4·1·144
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$a=\frac{-b}{2a}=\frac{24}{2}=12$

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