r^2-441=0

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Solution for r^2-441=0 equation: 


Simplifying
r2 + -441 = 0

Reorder the terms:
-441 + r2 = 0

Solving
-441 + r2 = 0

Solving for variable 'r'.

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

Add '441' to each side of the equation.
-441 + 441 + r2 = 0 + 441

Combine like terms: -441 + 441 = 0
0 + r2 = 0 + 441
r2 = 0 + 441

Combine like terms: 0 + 441 = 441
r2 = 441

Simplifying
r2 = 441

Take the square root of each side:
r = {-21, 21}

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