12.7^2+8.2^2=x^2

Solution for 12.7^2+8.2^2=x^2 equation:

12.7^2+8.2^2=x^2

We move all terms to the left:

12.7^2+8.2^2-(x^2)=0

We add all the numbers together, and all the variables

-1x^2+228.53=0

a = -1; b = 0; c = +228.53;
Δ = b2-4ac
Δ = 02-4·(-1)·228.53
Δ = 914.12
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{914.12}}{2*-1}=\frac{0-\sqrt{914.12}}{-2}
=-\frac{\sqrt{}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{914.12}}{2*-1}=\frac{0+\sqrt{914.12}}{-2}
=\frac{\sqrt{}}{-2}
$