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Math Help - I need help factoring (in R and in C) please...!?

  1. #1
    none86
    Guest

    I need help factoring (in R and in C) please...!?

    I need help factoring (in R and in C) please...!?
    I need help factoring the following please...

    1. Factor completely (in R), if possible:

    5x^2 - 625

    2. Factor completely (in R), if possible:

    5x^2 + 625

    3. Factor completely (in C), if possible:

    5x^2 + 625

    4. Factor completely (in R), if possible:

    5x^3 + 625

    5. Factor completely (in C), if possible:

    5x^3 + 625

    6. Factor completely (in R), if possible:

    5x^3 - 625

    Thanks so much for your help! :<)
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  2. #2
    Super Member wingless's Avatar
    Joined
    Dec 2007
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    Istanbul
    Posts
    585
    First factor them with 5. Then use addition or subtraction of squares or cubes.

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

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

    a^3 - b^3 = (a-b)(a^2+ab+b^2)
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  3. #3
    Member
    Joined
    Jul 2007
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    90
    and a^2+b^2 = (a+bi)(a-bi)
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