急!急! F4 Rational Functions Q3

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2012-02-23 00:14:42 補充：
21.
There is a typo.
My answer should be 3(x + 1)² and 3(x + 1)²(x - 2)
3(x + 1)²(x - 2)² is also an answer.

For Q38c

If y<0 and very close to 0, 1/y will be equal to -infinity.