(x+0.9)(x+0.9)=0

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Solution for (x+0.9)(x+0.9)=0 equation: 



(x+0.9)(x+0.9)=0

We multiply parentheses ..

(+x^2+0.9x+0.9x+0.81)=0

We get rid of parentheses

x^2+0.9x+0.9x+0.81=0

We add all the numbers together, and all the variables

x^2+1.8x+0.81=0

a = 1; b = 1.8; c = +0.81;
Δ = b2-4ac
Δ = 1.82-4·1·0.81
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-1.8}{2}=-1/1.1111111111111$

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