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-x2-2x=5
We move all terms to the left:
-x2-2x-(5)=0
We add all the numbers together, and all the variables
-1x^2-2x-5=0
a = -1; b = -2; c = -5;
Δ = b2-4ac
Δ = -22-4·(-1)·(-5)
Δ = -16
Delta is less than zero, so there is no solution for the equation
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