21=-1.5x(x-2)

Solution for 21=-1.5x(x-2) equation:

21=-1.5x(x-2)

We move all terms to the left:

21-(-1.5x(x-2))=0


We calculate terms in parentheses: -(-1.5x(x-2)), so:

-1.5x(x-2)

We multiply parentheses

-x^2+2x

We add all the numbers together, and all the variables

-1x^2+2x

Back to the equation:

-(-1x^2+2x)


We get rid of parentheses

1x^2-2x+21=0

We add all the numbers together, and all the variables

x^2-2x+21=0

a = 1; b = -2; c = +21;
Δ = b2-4ac
Δ = -22-4·1·21
Δ = -80
Delta is less than zero, so there is no solution for the equation