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I can't seem to work out how my textbook got from the denominator($x^2 - x$) in the first line to the divisor below it ($x^2 +2x - 3$). Could anyone explain how they got from one to the other?

Thanks!

textbook question

Edit: A similar question which I do understand is here, for context:

enter image description here

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    @Dan It's surely a misprint - the fraction in (c) has no relation to the following long division.2011-05-02

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The general consensus is that it is a misprint in the book.