72 = 49
82 = 64
Its closer to 49 so say 7
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54 cubed = 54 x 54 x 54 =157464 and hence square root of 157464 is 396.817
2 square root 27
x^2 = 54; take the square root of both sides, so x = +/- square root of 54 , or simplified is +/- 3 times square root of 6.
18
7 and 8