3x(x-2)=9x^2-11x

Solution for 3x(x-2)=9x^2-11x equation:

3x(x-2)=9x^2-11x

We move all terms to the left:

3x(x-2)-(9x^2-11x)=0

We multiply parentheses

3x^2-6x-(9x^2-11x)=0

We get rid of parentheses

3x^2-9x^2-6x+11x=0

We add all the numbers together, and all the variables

-6x^2+5x=0

a = -6; b = 5; c = 0;
Δ = b2-4ac
Δ = 52-4·(-6)·0
Δ = 25
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{25}=5$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-5}{2*-6}=\frac{-10}{-12}
=5/6
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+5}{2*-6}=\frac{0}{-12}
=0
$