r^2-13=0

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Solution for r^2-13=0 equation: 


Simplifying
r2 + -13 = 0

Reorder the terms:
-13 + r2 = 0

Solving
-13 + r2 = 0

Solving for variable 'r'.

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

Add '13' to each side of the equation.
-13 + 13 + r2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + r2 = 0 + 13
r2 = 0 + 13

Combine like terms: 0 + 13 = 13
r2 = 13

Simplifying
r2 = 13

Take the square root of each side:
r = {-3.605551275, 3.605551275}

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