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-3x(x+2)=12
We move all terms to the left:
-3x(x+2)-(12)=0
We multiply parentheses
-3x^2-6x-12=0
a = -3; b = -6; c = -12;
Δ = b2-4ac
Δ = -62-4·(-3)·(-12)
Δ = -108
Delta is less than zero, so there is no solution for the equation
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