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11x^2+6x+15=12
We move all terms to the left:
11x^2+6x+15-(12)=0
We add all the numbers together, and all the variables
11x^2+6x+3=0
a = 11; b = 6; c = +3;
Δ = b2-4ac
Δ = 62-4·11·3
Δ = -96
Delta is less than zero, so there is no solution for the equation
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