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Thread: How do i factor this?

  1. September 18th 2008, 02:30 PM #1
    jarr3d
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    How do i factor this?

    How do i factor this?

    1331x^9 + 343y^6
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  2. September 18th 2008, 02:43 PM #2
    Plato
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    Sum of cubes?
    \left( {11x^3 + 7y^2 } \right)\left( {121x^6 - 77x^3 y^2 + 49y^4 } \right)
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  3. September 18th 2008, 02:44 PM #3
    skeeter
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    sum of two cubes factors as shown ...

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


    now note that ...

    1331x^9 + 343y^6 = (11x^3)^3 + (7y^2)^3
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  4. September 18th 2008, 02:45 PM #4
    jarr3d
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    Can you show how its done?
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  5. September 18th 2008, 02:45 PM #5
    jarr3d
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    ok
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