-3x(4x+1)=21

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Solution for -3x(4x+1)=21 equation: 



-3x(4x+1)=21

We move all terms to the left:

-3x(4x+1)-(21)=0

We multiply parentheses

-12x^2-3x-21=0

a = -12; b = -3; c = -21;
Δ = b2-4ac
Δ = -32-4·(-12)·(-21)
Δ = -999
Delta is less than zero, so there is no solution for the equation

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