r^2=80

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Solution for r^2=80 equation: 


Simplifying
r2 = 80

Solving
r2 = 80

Solving for variable 'r'.

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

Simplifying
r2 = 80

Take the square root of each side:
r = {-8.94427191, 8.94427191}

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