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3*sqrt(45) - 3*sqrt(5) =3*sqrt(9*5) - 3*sqrt(5) = 3*sqrt(9)*sqrt(5) - 3*sqrt(5)

= 3*3*sqrt(5) - 3*sqrt(5) (taking the principal root)

= 9*sqrt(5) - 3*sqrt(5) = 6*sqrt(5)

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Q: What is 3 square root of 45 minus 3 square root of 5?
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