r^2-36=

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Solution for r^2-36= equation: 


Simplifying
r2 + -36 = 0

Reorder the terms:
-36 + r2 = 0

Solving
-36 + r2 = 0

Solving for variable 'r'.

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

Add '36' to each side of the equation.
-36 + 36 + r2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + r2 = 0 + 36
r2 = 0 + 36

Combine like terms: 0 + 36 = 36
r2 = 36

Simplifying
r2 = 36

Take the square root of each side:
r = {-6, 6}

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