x2+3x+15=3

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Solution for x2+3x+15=3 equation: 



x2+3x+15=3

We move all terms to the left:

x2+3x+15-(3)=0

We add all the numbers together, and all the variables

x^2+3x+12=0

a = 1; b = 3; c = +12;
Δ = b2-4ac
Δ = 32-4·1·12
Δ = -39
Delta is less than zero, so there is no solution for the equation

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