192 = 64 * 3, with sqrt() meaning sqare root of (what's in parentheses)
So sqrt(192) = sqrt(64) * sqrt(3) = 8 * sqrt(3) [written eight radical three]
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6 radical 6
2 radical(8) = 4 radical(2)
just round off the number after the decimal if it is above 5.
Radical (3x) = radical(x) * radical(3).
To eliminate the radical in the denominator.