Tutorial

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Caution - In the last step of the third problem I multiplied 3x35 and got 115 instead of 105. Therefore, the 4th term in the expansion should have been 105sqrt(3). The simplified form of the final expansion should be 568+328sqrt(3)

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Note that the terms in the first expansion alternate from positive to negative! Terms 2, 4, and 6 have negative coefficients (I said terms 2,3, and 4).

Also in the third example I say that "we will be subtracting h" when I should have said "we will be dividing by h".

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