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0=-x^2-15x-9735
We move all terms to the left:
0-(-x^2-15x-9735)=0
We add all the numbers together, and all the variables
-(-x^2-15x-9735)=0
We get rid of parentheses
x^2+15x+9735=0
a = 1; b = 15; c = +9735;
Δ = b2-4ac
Δ = 152-4·1·9735
Δ = -38715
Delta is less than zero, so there is no solution for the equation
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