a^2+5^2=12^2

Solution for a^2+5^2=12^2 equation:

a^2+5^2=12^2

We move all terms to the left:

a^2+5^2-(12^2)=0

We add all the numbers together, and all the variables

a^2-119=0

a = 1; b = 0; c = -119;
Δ = b2-4ac
Δ = 02-4·1·(-119)
Δ = 476
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{476}=\sqrt{4*119}=\sqrt{4}*\sqrt{119}=2\sqrt{119}$
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2\sqrt{119}}{2*1}=\frac{0-2\sqrt{119}}{2}
=-\frac{2\sqrt{119}}{2}
=-\sqrt{119}
$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2\sqrt{119}}{2*1}=\frac{0+2\sqrt{119}}{2}
=\frac{2\sqrt{119}}{2}
=\sqrt{119}
$