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    So this question has been really getting me, I know the answer is the first option but am wondering how to work that out, could anyone show me? Thank you!
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    You just rationalize the denominator so multiply top and bottom by:

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    So:

    Attachment 575898575902


    Hope this helps
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    (Original post by hischebioict)
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    So this question has been really getting me, I know the answer is the first option but am wondering how to work that out, could anyone show me? Thank you!
    You need to know the rule "difference between two squares" it is (a+b)(a-b)=a2-b2
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    (Original post by AlexJT)
    You just rationalize the denominator so multiply top and bottom by:

    Name:  Spectacle.T20976.png
Views: 55
Size:  1.2 KB

    So:

    [WORKING OUT]

    Hope this helps
    Let's try and not do the question for the person. You can point him to what needs to be done just don't spoil it.
 
 
 
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