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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses ..

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

We get rid of parentheses

X^2-9X+3X-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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