-13=X^2-6x-4

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Solution for -13=X^2-6x-4 equation: 



-13=X^2-6X-4

We move all terms to the left:

-13-(X^2-6X-4)=0

We get rid of parentheses

-X^2+6X+4-13=0

We add all the numbers together, and all the variables

-1X^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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