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Should I memorize these as well? a^3+b^3 =

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Should I memorize these as well? a^3+b^3 = [#permalink]

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21 Jul 2008, 13:44
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Should I memorize these as well?

$$a^3+b^3 = (a+b)(a^2-ab+b^2)$$

and

$$a^3-b^3 = (a-b)(a^2+ab+b^2)$$

Thanks!
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21 Jul 2008, 13:45
asdert wrote:
Should I memorize these as well?

$$a^3+b^3 = (a+b)(a^2-ab+b^2)$$

and

$$a^3-b^3 = (a-b)(a^2+ab+b^2)$$

Thanks!

Couldn't hurt -- why take a chance?
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