4x-2x(-3)x=20

Solution for 4x-2x(-3)x=20 equation:

4x-2x(-3)x=20

We move all terms to the left:

4x-2x(-3)x-(20)=0

We multiply parentheses

6x^2+4x-20=0

a = 6; b = 4; c = -20;
Δ = b2-4ac
Δ = 42-4·6·(-20)
Δ = 496
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:

$\sqrt{\Delta}=\sqrt{496}=\sqrt{16*31}=\sqrt{16}*\sqrt{31}=4\sqrt{31}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-4\sqrt{31}}{2*6}=\frac{-4-4\sqrt{31}}{12}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+4\sqrt{31}}{2*6}=\frac{-4+4\sqrt{31}}{12}
$