109.86=r*r

Solution for 109.86=r*r equation:

Simplifying
109.86 = r * r

Multiply r * r
109.86 = r2

Solving
109.86 = r2

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-1r2' to each side of the equation.
109.86 + -1r2 = r2 + -1r2

Combine like terms: r2 + -1r2 = 0
109.86 + -1r2 = 0

Add '-109.86' to each side of the equation.
109.86 + -109.86 + -1r2 = 0 + -109.86

Combine like terms: 109.86 + -109.86 = 0.00
0.00 + -1r2 = 0 + -109.86
-1r2 = 0 + -109.86

Combine like terms: 0 + -109.86 = -109.86
-1r2 = -109.86

Divide each side by '-1'.
r2 = 109.86

Simplifying
r2 = 109.86

Take the square root of each side:
r = {-10.481412119, 10.481412119}