r^2-121=

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Solution for r^2-121= equation: 


Simplifying
r2 + -121 = 0

Reorder the terms:
-121 + r2 = 0

Solving
-121 + r2 = 0

Solving for variable 'r'.

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

Add '121' to each side of the equation.
-121 + 121 + r2 = 0 + 121

Combine like terms: -121 + 121 = 0
0 + r2 = 0 + 121
r2 = 0 + 121

Combine like terms: 0 + 121 = 121
r2 = 121

Simplifying
r2 = 121

Take the square root of each side:
r = {-11, 11}

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