7x(-3-4x)=12

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Solution for 7x(-3-4x)=12 equation: 



7x(-3-4x)=12

We move all terms to the left:

7x(-3-4x)-(12)=0

We add all the numbers together, and all the variables

7x(-4x-3)-12=0

We multiply parentheses

-28x^2-21x-12=0

a = -28; b = -21; c = -12;
Δ = b2-4ac
Δ = -212-4·(-28)·(-12)
Δ = -903
Delta is less than zero, so there is no solution for the equation

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