6561=m^2

Solution for 6561=m^2 equation:

6561=m^2

We move all terms to the left:

6561-(m^2)=0

We add all the numbers together, and all the variables

-1m^2+6561=0

a = -1; b = 0; c = +6561;
Δ = b2-4ac
Δ = 02-4·(-1)·6561
Δ = 26244
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{26244}=162$
$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-162}{2*-1}=\frac{-162}{-2}
=+81
$
$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+162}{2*-1}=\frac{162}{-2}
=-81
$