r2-1/81

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Solution for r2-1/81 equation: 


r in (-oo:+oo)

r^2-(1/81) = 0

r^2-1/81 = 0

1*r^2 = 1/81 // : 1

r^2 = 1/81

r^2 = 1/81 // ^ 1/2

abs(r) = 1/9

r = 1/9 or r = -1/9

r in { 1/9, -1/9 }

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