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Math Help - Basic Algebra...

  1. #1
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    Unhappy Basic Algebra...

    OK, I need help with two pretty basic questions. I keep making the same stupid mistakes. Please help!

    Solve to the smallest equation.
    1. (a-b)c2 + (b-a)c4

    My working out so far:
    = c2 [(a-b)+(b-a)c2)]
    ... then I don't know what to do. I know the answer is c2 (a-b), but how do I get there?


    2. (x-y)2 -z2 / (x+z)2 -y2

    So it occurs to me to use those math equations like following:
    x2 +2xy +y2 -z2 / x2 + 2xz + z2 -y2

    And then what? I'm not very good at maths...
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  2. #2
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    Re: Basic Algebra...

    Well b-a=-(a-b) so you have

    (a-b)c^2-(a-b)c^4

    = (a-b)(c^2-c^4)

    any ideas from there?

    By the way it's not an equation.
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  3. #3
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    Re: Basic Algebra...

    Thanks yeah I can figure it out from there. I don't know what these things are called in English ) thank you very much
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  4. #4
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    Re: Basic Algebra...

    In English these are called 'expressions'
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  5. #5
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    Re: Basic Algebra...

    thanks ) do you know how I can simplify the second expression?
    Last edited by keepmymemory; April 5th 2012 at 06:22 AM.
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  6. #6
    Member Sylvia104's Avatar
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    Re: Basic algebra

    Quote Originally Posted by keepmymemory View Post
    do you know how I can simplify the second expression?
    Instead of expanding, factorize the numerator and the denominator.
    Thanks from keepmymemory
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  7. #7
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    Re: Basic algebra

    Thank you! It worked
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