3x(2x-4)=-1

Solution for 3x(2x-4)=-1 equation:

3x(2x-4)=-1

We move all terms to the left:

3x(2x-4)-(-1)=0

We add all the numbers together, and all the variables

3x(2x-4)+1=0

We multiply parentheses

6x^2-12x+1=0

a = 6; b = -12; c = +1;
Δ = b2-4ac
Δ = -122-4·6·1
Δ = 120
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:

$\sqrt{\Delta}=\sqrt{120}=\sqrt{4*30}=\sqrt{4}*\sqrt{30}=2\sqrt{30}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-12)-2\sqrt{30}}{2*6}=\frac{12-2\sqrt{30}}{12}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-12)+2\sqrt{30}}{2*6}=\frac{12+2\sqrt{30}}{12}
$