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**Xenophobe** Hey all. Just started a correspondence course with a different school board, and they have a different curriculum. I only learned how to factor typical polynomials at my normal school, but they have different questions that I am unsure how to do or how to categorise them. Here is a question that I am stuck on:

(x - d)^2 + x - d

The answer, according to the book, is: (x-d)(x-d+1)

I am unsure how to go about doing this problem *at all. *I have been searching around different math sites for about an hour now trying to find this type of problem, but as I am unsure how to categorise it besides "factoring", I got little results.