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Math Help - trinomial

  1. #1
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    trinomial

    this is confusing. how do you expand this, any tips on how to expand trinomials??

    x^3 + 8
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  2. #2
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    Quote Originally Posted by algebra2 View Post
    this is confusing. how do you expand this, any tips on how to expand trinomials??

    x^3 + 8
    This is already expanded.

    If you mean factor notice that this is the sum of cubes

    x^3+2^3=(x+2)(x^2-2x+4)

    I hope this helps.

    Good luck.
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  3. #3
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    could you explain it a bit
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  4. #4
    Behold, the power of SARDINES!
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    Quote Originally Posted by algebra2 View Post
    could you explain it a bit

    This is a formula that should be memorized

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

    for your problem we had

    x^3+8=x^3+2^3

    a=x and b=2 so we get

    x^3+2^3=(x+2)(x^2-2x+4)

    I hope this helps.
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