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Math Help - Factorise

  1. #1
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    Factorise

    Factorise:

    4 / x^2 - a^2 / b^2
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  2. #2
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    Hello,

    Note that 4 is 2

    Then if you have x and y as : x/y, you can say that it is equal to (x/y)

    & finally, use the x-y factorisation
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  3. #3
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    Quote Originally Posted by stellina_91 View Post
    Factorise:

    4 / x^2 - a^2 / b^2
    = \left( \frac{2}{x} \right)^2 - \left( \frac{a}{b} \right)^2 .

    Factorise using the difference of perfect squares formula.
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