77299.26=r^2

Solution for 77299.26=r^2 equation:

77299.26=r^2

We move all terms to the left:

77299.26-(r^2)=0

We add all the numbers together, and all the variables

-1r^2+77299.26=0

a = -1; b = 0; c = +77299.26;
Δ = b2-4ac
Δ = 02-4·(-1)·77299.26
Δ = 309197.04
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{309197.04}}{2*-1}=\frac{0-\sqrt{309197.04}}{-2}
=-\frac{\sqrt{}}{-2}
$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{309197.04}}{2*-1}=\frac{0+\sqrt{309197.04}}{-2}
=\frac{\sqrt{}}{-2}
$