-3x(2x+4)=31

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Solution for -3x(2x+4)=31 equation: 



-3x(2x+4)=31

We move all terms to the left:

-3x(2x+4)-(31)=0

We multiply parentheses

-6x^2-12x-31=0

a = -6; b = -12; c = -31;
Δ = b2-4ac
Δ = -122-4·(-6)·(-31)
Δ = -600
Delta is less than zero, so there is no solution for the equation

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