2x(x-2)=46

Solution for 2x(x-2)=46 equation:

2x(x-2)=46

We move all terms to the left:

2x(x-2)-(46)=0

We multiply parentheses

2x^2-4x-46=0

a = 2; b = -4; c = -46;
Δ = b2-4ac
Δ = -42-4·2·(-46)
Δ = 384
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:

$\sqrt{\Delta}=\sqrt{384}=\sqrt{64*6}=\sqrt{64}*\sqrt{6}=8\sqrt{6}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-8\sqrt{6}}{2*2}=\frac{4-8\sqrt{6}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+8\sqrt{6}}{2*2}=\frac{4+8\sqrt{6}}{4}
$