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# I noticed that toward the end of the OG DS and PS questions,

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Director
Joined: 28 Oct 2003
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I noticed that toward the end of the OG DS and PS questions, [#permalink]  27 Dec 2003, 23:59
I noticed that toward the end of the OG DS and PS questions, it becomes pretty important to be able to factor expressions such as a^4-b^4.
Or a^2-b^2.

I don't have any of these memorized, and I think it's probably better just to memorize them.

Does anyone know the quick way to factor them, or can anyone point to a list somewhere online?
Director
Joined: 13 Nov 2003
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Hallo Stolfi, i will try to give you a hand here
1)A^4-B^4= (A^2-B^2)(A^2+B^2)
2)A^2-B^2= (A-B)(A+B)
you can use 2) to factor first factor in 1). I do not think it is possible to factor A^2+B^2, since it is equal to (A+B)(A+B)-2AB=(A+B)^2-2AB
Senior Manager
Joined: 05 May 2003
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Stoolfi, memorizing will save you sometime on test day.
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