36
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√(16/81) = (√16)/(√81) = 4/9 → The two roots are 4/9 and -4/9
The greatest common factor between 36 and 81 is 9. 36/9 = 4 and 81/9 = 9.36/81 = 4/9.
(4/9) * (5/9) = 20/81
36.
The GCF is 9 36/81 = 4/9