r^2-18=0

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Solution for r^2-18=0 equation: 


Simplifying
r2 + -18 = 0

Reorder the terms:
-18 + r2 = 0

Solving
-18 + r2 = 0

Solving for variable 'r'.

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

Add '18' to each side of the equation.
-18 + 18 + r2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + r2 = 0 + 18
r2 = 0 + 18

Combine like terms: 0 + 18 = 18
r2 = 18

Simplifying
r2 = 18

Take the square root of each side:
r = {-4.242640687, 4.242640687}

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