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Math Help - Factorise

  1. #1
    Junior Member
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    Question Factorise

    How do you factorise the following:
    r^3-6r^2+32

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  2. #2
    Math Engineering Student
    Krizalid's Avatar
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    Santiago, Chile
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    Okay, here's a Hint:

    r^3-6r^2+32=r^3+(2r^2-8r^2)+(16r-16r)+32.
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  3. #3
    Junior Member
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    Question

    I'm still confused. Is there a rule you can follow to get the correct answer? For all examples with x^3.
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  4. #4
    MHF Contributor kalagota's Avatar
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    Oct 2007
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    Taguig City, Philippines
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    i think, this is an easier hint:

    r^3 + 2r^2 - 8r^2 +32
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