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Math Help - cubes

  1. #1
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    cubes

    hi can someone show me the formula for these please-

    (a - b)^3

    and

    (a + b)^3

    thanks
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  2. #2
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    Hi,

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

    (a+b)^3 = a^3+3a^2b+3ab^2+b^3
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  3. #3
    Super Member
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    Smile

    hi
    for the second one u can use :
    (a+b)^n=\sum_{k=0}^{n}\begin{pmatrix}<br />
n\\ <br />
k<br />
\end{pmatrix}a^{n-k}b^{k}
    ( Binomial theorem )
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  4. #4
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    could anyone also tell me the formula for:

    (a + b)^4

    and

    (a - b)^4?

    thankyou
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  5. #5
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    Quote Originally Posted by mark View Post
    could anyone also tell me the formula for:

    (a + b)^4

    and

    (a - b)^4?

    thankyou
    The Binomial Theorem: Formulas
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