(2x+9)(2x+9)=0

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Solution for (2x+9)(2x+9)=0 equation: 



(2x+9)(2x+9)=0

We multiply parentheses ..

(+4x^2+18x+18x+81)=0

We get rid of parentheses

4x^2+18x+18x+81=0

We add all the numbers together, and all the variables

4x^2+36x+81=0

a = 4; b = 36; c = +81;
Δ = b2-4ac
Δ = 362-4·4·81
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-36}{8}=-4+1/2$

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