z^2-8z+16=2

Solution for z^2-8z+16=2 equation:

z^2-8z+16=2

We move all terms to the left:

z^2-8z+16-(2)=0

We add all the numbers together, and all the variables

z^2-8z+14=0

a = 1; b = -8; c = +14;
Δ = b2-4ac
Δ = -82-4·1·14
Δ = 8
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{8}=\sqrt{4*2}=\sqrt{4}*\sqrt{2}=2\sqrt{2}$
$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-8)-2\sqrt{2}}{2*1}=\frac{8-2\sqrt{2}}{2}
$
$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-8)+2\sqrt{2}}{2*1}=\frac{8+2\sqrt{2}}{2}
$