-3x(x-2)+4x=21

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Solution for -3x(x-2)+4x=21 equation: 



-3x(x-2)+4x=21

We move all terms to the left:

-3x(x-2)+4x-(21)=0

We add all the numbers together, and all the variables

4x-3x(x-2)-21=0

We multiply parentheses

-3x^2+4x+6x-21=0

We add all the numbers together, and all the variables

-3x^2+10x-21=0

a = -3; b = 10; c = -21;
Δ = b2-4ac
Δ = 102-4·(-3)·(-21)
Δ = -152
Delta is less than zero, so there is no solution for the equation

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