12,72^2=2c^2

Solution for 12,72^2=2c^2 equation:

12.72^2=2c^2

We move all terms to the left:

12.72^2-(2c^2)=0

We add all the numbers together, and all the variables

-2c^2+161.7984=0

a = -2; b = 0; c = +161.7984;
Δ = b2-4ac
Δ = 02-4·(-2)·161.7984
Δ = 1294.3872
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{1294.3872}}{2*-2}=\frac{0-\sqrt{1294.3872}}{-4}
=-\frac{\sqrt{}}{-4}
$
$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{1294.3872}}{2*-2}=\frac{0+\sqrt{1294.3872}}{-4}
=\frac{\sqrt{}}{-4}
$