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posted by Bill on Wednesday, November 9, 2011 at 3:25pm.

Multiply , then simplify 5 sqrt:75 - 7 sqrt:3

5sqrt75 - 7sqrt3, = 5sqrt(25*3) - 7sqrt3 = 5*5sqrt3 - 7sqrt3 = 25sqrt3 - 7sqrt3 = 18sqrt3.

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