(x-9)(x+3)=-36

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Solution for (x-9)(x+3)=-36 equation: 



(x-9)(x+3)=-36

We move all terms to the left:

(x-9)(x+3)-(-36)=0

We add all the numbers together, and all the variables

(x-9)(x+3)+36=0

We multiply parentheses ..

(+x^2+3x-9x-27)+36=0

We get rid of parentheses

x^2+3x-9x-27+36=0

We add all the numbers together, and all the variables

x^2-6x+9=0

a = 1; b = -6; c = +9;
Δ = b2-4ac
Δ = -62-4·1·9
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{6}{2}=3$

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