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Verified Answer :

9√(72)

9
√(236)

9
√(2)√(36)

9
√(2)6

9
6*√(2)

54√(2)

\(9\sqrt{72} \\9\sqrt{36 * 2} \\9\sqrt{36}\sqrt{2} \\9(6\sqrt{2}) \\54\sqrt{2}\)