486 = 81 x 6
sqrt 486 = sqrt (81 x 6) = 9sqrt(6)
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486 = 2*35 =2*3*34 so sqrt(486) = sqrt(2*3*34) = sqrt(2*3)*sqrt(34) = sqrt(6)*32 = 9*sqrt(6).
The square root of seven can not be simplified any further while still remaining exact.
The square root of 147, simplified, is: ± 12.1
The √35 is simplified, no perfect square can go into 35
The square root of 144 is 12 or -12.
Simplified, the square root of 35 is just root 35. The decimal is about 5.916079763.