(3x-15)(3x-15)=0

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Solution for (3x-15)(3x-15)=0 equation: 



(3x-15)(3x-15)=0

We multiply parentheses ..

(+9x^2-45x-45x+225)=0

We get rid of parentheses

9x^2-45x-45x+225=0

We add all the numbers together, and all the variables

9x^2-90x+225=0

a = 9; b = -90; c = +225;
Δ = b2-4ac
Δ = -902-4·9·225
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{90}{18}=5$

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