X2+2x-15=-16

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Solution for X2+2x-15=-16 equation: 



X2+2X-15=-16

We move all terms to the left:

X2+2X-15-(-16)=0

We add all the numbers together, and all the variables

X^2+2X+1=0

a = 1; b = 2; c = +1;
Δ = b2-4ac
Δ = 22-4·1·1
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$X=\frac{-b}{2a}=\frac{-2}{2}=-1$

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