To simplify the expression 9 sqrt(3) x 6 sqrt(7), we can multiply the coefficients (9 x 6) and multiply the square roots (sqrt(3) x sqrt(7)).
9 x 6 = 54
sqrt(3) x sqrt(7) = sqrt(3 x 7) = sqrt(21)
Putting it all together, the simplified expression is 54 sqrt(21).
9 sqrt 3 x 6 sqrt 7
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