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

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Senior Manager
Joined: 09 Oct 2007
Posts: 463

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

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21 Jul 2008, 14:44
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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!

Kudos [?]: 54 [0], given: 1

Director
Joined: 12 Jul 2008
Posts: 514

Kudos [?]: 162 [0], given: 0

Schools: Wharton

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21 Jul 2008, 14:45
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?

Kudos [?]: 162 [0], given: 0

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