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Math Help - pretty simple algebra problem (i think)

  1. #1
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    pretty simple algebra problem (i think)

    I'm way beyond this but just starting the school year i'm having a complete brain block about how to do this.
    how would i solve this equation?
    5/x^2 = 8/(10+x)^2

    i can expand the demoninator on the right, but then... i have no clue where to go. this is preventing me from solving a larger problem and it's driving me crazy that i don't know what to do. any advice?
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  2. #2
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    Quote Originally Posted by isuckatcalc View Post
    I'm way beyond this but just starting the school year i'm having a complete brain block about how to do this.
    how would i solve this equation?
    5/x^2 = 8/(10+x)^2

    i can expand the demoninator on the right, but then... i have no clue where to go. this is preventing me from solving a larger problem and it's driving me crazy that i don't know what to do. any advice?
    I'd cross multiply first to clear the fraction

    5(10+x)^2 = 8x^2

    Expand the brackets, put into the form ax^2 + bx + c = 0 and solve the quadratic. Remember that the 5 is not squared!
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  3. #3
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    agh quadratic!! thank you very much. exactly what i needed.
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