So,

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So,

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How do we get (a-b)^3=a^3-3a^2b+3ab^2-b^3 if it is not (a-b)(a-b)(a-b)

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Hi, yes, you are right, is .

Continue to expand, you will get .

Hope it helps!

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There is one challenging USA Math Olympiad 1997 (USA) question using this technique, see

my blog at:

http://tomcircle.wordpress.com/2013/05/07/imo-technique/

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Your blogs seems to me a great place for math lovers. I love to solve math problems…so this is the right place for me…Thanks for sharing o level maths here.

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Reblogged this on Singapore Maths Tuition.

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