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Thread: factorising polynomials

  1. November 15th 2009, 11:34 PM #1
    birky
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    factorising polynomials

    Hi does anyone know how to factorise 80 - (5k)^2

    thanks in advance.
    Last edited by mr fantastic; November 16th 2009 at 02:45 AM.
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  2. November 16th 2009, 02:46 AM #2
    mr fantastic
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    Quote Originally Posted by birky View Post
    Hi does anyone know how to factorise 80 - (5k)^2

    thanks in advance.
    You have (\sqrt{80})^2 - (5k)^2 so use the Difference of Two Squares formula A^2 - B^2 = (A - B)(A + B).
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  3. November 16th 2009, 03:13 AM #3
    Raoh
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    Hello
    80-(5k)^{2}=80-25k^{2}=-5(5k^2-16)
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