0=18-2r^2

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Solution for 0=18-2r^2 equation: 


Simplifying
0 = 18 + -2r2

Solving
0 = 18 + -2r2

Solving for variable 'r'.

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

Add '2r2' to each side of the equation.
0 + 2r2 = 18 + -2r2 + 2r2
Remove the zero:
2r2 = 18 + -2r2 + 2r2

Combine like terms: -2r2 + 2r2 = 0
2r2 = 18 + 0
2r2 = 18

Divide each side by '2'.
r2 = 9

Simplifying
r2 = 9

Take the square root of each side:
r = {-3, 3}

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