-5x(6+4x)=21

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Solution for -5x(6+4x)=21 equation: 



-5x(6+4x)=21

We move all terms to the left:

-5x(6+4x)-(21)=0

We add all the numbers together, and all the variables

-5x(4x+6)-21=0

We multiply parentheses

-20x^2-30x-21=0

a = -20; b = -30; c = -21;
Δ = b2-4ac
Δ = -302-4·(-20)·(-21)
Δ = -780
Delta is less than zero, so there is no solution for the equation

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