x.2(x+4)=16

Solution for x.2(x+4)=16 equation:

x.2(x+4)=16

We move all terms to the left:

x.2(x+4)-(16)=0

We multiply parentheses

x^2+4x-16=0

a = 1; b = 4; c = -16;
Δ = b2-4ac
Δ = 42-4·1·(-16)
Δ = 80
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:

$\sqrt{\Delta}=\sqrt{80}=\sqrt{16*5}=\sqrt{16}*\sqrt{5}=4\sqrt{5}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-4\sqrt{5}}{2*1}=\frac{-4-4\sqrt{5}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+4\sqrt{5}}{2*1}=\frac{-4+4\sqrt{5}}{2}
$