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3x(x+2)=-40
We move all terms to the left:
3x(x+2)-(-40)=0
We add all the numbers together, and all the variables
3x(x+2)+40=0
We multiply parentheses
3x^2+6x+40=0
a = 3; b = 6; c = +40;
Δ = b2-4ac
Δ = 62-4·3·40
Δ = -444
Delta is less than zero, so there is no solution for the equation
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