How do you do these?

This is the formula and a sample question.

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

b^3 - 8

Please, someone elxplain this to me

* ^ means power

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- February 10th 2009, 09:20 PMNeedhelpatmaths[SOLVED] Sums and Differences of 2 Cubes
How do you do these?

This is the formula and a sample question.

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

b^3 - 8

Please, someone elxplain this to me

* ^ means power - February 10th 2009, 09:38 PMo_O
I'll use instead of to avoid confusion with the variables:

...........So our identity says:

So directly sub in our values: - February 10th 2009, 09:41 PMmathaddict
- February 10th 2009, 09:43 PMNeedhelpatmathsok I think I got it
Kk thankyou