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Math Help - Factorise :/

  1. #1
    Senior Member Mukilab's Avatar
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    Factorise :/

    a^2-9b^2

    Don't know what to put as the subject...-1/1?
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  2. #2
    Master Of Puppets
    pickslides's Avatar
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    Quote Originally Posted by Mukilab View Post
    a^2-9b^2
    a^2-9b^2

    a^2-3^2b^2

    a^2-(3b)^2

    using the difference of 2 squares rule

    (a-3b)(a+3b)


    Quote Originally Posted by Mukilab View Post

    Don't know what to put as the subject...-1/1?
    what do you mean by this?
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  3. #3
    Senior Member Mukilab's Avatar
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    Quote Originally Posted by pickslides View Post
    a^2-9b^2

    a^2-3^2b^2

    a^2-(3b)^2

    using the difference of 2 squares rule

    (a-3b)(a+3b)




    what do you mean by this?

    I meant what should I put at the start of the quadratic, take the 'subject' as x. You would do (x ......)(x......)


    Thanks for the great explanation and WIP! ^^
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