2x(2x-2)=6

Solution for 2x(2x-2)=6 equation:

2x(2x-2)=6

We move all terms to the left:

2x(2x-2)-(6)=0

We multiply parentheses

4x^2-4x-6=0

a = 4; b = -4; c = -6;
Δ = b2-4ac
Δ = -42-4·4·(-6)
Δ = 112
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{112}=\sqrt{16*7}=\sqrt{16}*\sqrt{7}=4\sqrt{7}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-4\sqrt{7}}{2*4}=\frac{4-4\sqrt{7}}{8}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+4\sqrt{7}}{2*4}=\frac{4+4\sqrt{7}}{8}
$