(x+15)(x+15)=0

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Solution for (x+15)(x+15)=0 equation: 



(x+15)(x+15)=0

We multiply parentheses ..

(+x^2+15x+15x+225)=0

We get rid of parentheses

x^2+15x+15x+225=0

We add all the numbers together, and all the variables

x^2+30x+225=0

a = 1; b = 30; c = +225;
Δ = b2-4ac
Δ = 302-4·1·225
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-30}{2}=-15$

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