4(x+21)=-3x(x-7)

Solution for 4(x+21)=-3x(x-7) equation:

4(x+21)=-3x(x-7)

We move all terms to the left:

4(x+21)-(-3x(x-7))=0

We multiply parentheses

4x-(-3x(x-7))+84=0


We calculate terms in parentheses: -(-3x(x-7)), so:

-3x(x-7)

We multiply parentheses

-3x^2+21x

Back to the equation:

-(-3x^2+21x)


We get rid of parentheses

3x^2-21x+4x+84=0

We add all the numbers together, and all the variables

3x^2-17x+84=0

a = 3; b = -17; c = +84;
Δ = b2-4ac
Δ = -172-4·3·84
Δ = -719
Delta is less than zero, so there is no solution for the equation