r^2+-20=0

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Solution for r^2+-20=0 equation: 


Simplifying
r2 + -20 = 0

Reorder the terms:
-20 + r2 = 0

Solving
-20 + r2 = 0

Solving for variable 'r'.

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

Add '20' to each side of the equation.
-20 + 20 + r2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + r2 = 0 + 20
r2 = 0 + 20

Combine like terms: 0 + 20 = 20
r2 = 20

Simplifying
r2 = 20

Take the square root of each side:
r = {-4.472135955, 4.472135955}

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