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First, note that radical 4 is 2. So 3xradical 4 is just 6, Now we have 6+2 radical 3. You can't do much with this except factor out a 2 if you want 2(3+Radical 3)
3 sqrt(6) x sqrt(6) = 18
D.2√3
(6√5)/√3 since the index is the same and both numbers are positive, we can write = 6(√5/3) multiply inside the radical by 3/3 to make the denominator a perfect square number = 6(√15/9) = (6/3)√15 = 2√15
√108 = √(36 X 3) = 6√3