(x-30)(x-30)=0

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Solution for (x-30)(x-30)=0 equation: 



(x-30)(x-30)=0

We multiply parentheses ..

(+x^2-30x-30x+900)=0

We get rid of parentheses

x^2-30x-30x+900=0

We add all the numbers together, and all the variables

x^2-60x+900=0

a = 1; b = -60; c = +900;
Δ = b2-4ac
Δ = -602-4·1·900
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{60}{2}=30$

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