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    I first simplify the root75 to 5root3.
    Rationalise the second to 9root3 over 3.
    Simplify root12 into 2root3

    5root3 - 9root3 / 3 + 2root3 .

    Multiply through by the denominator of 3 to give:
    15root3 - 9root3 + 6root3 = 10root3.

    The answer is wrong :confused:
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    I think the answer is 4root3 , there isn't a mark scheme available which is why I'm not sure .
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    I did the question before looking at how you did it.

    I had the same up until - "Multiply through by the denominator of 3"

    At the point I simply did 9root3/3=3root3 (ie. Just the 9 divided by 3)

    So I ended up with:
    5root3 - 3root3 + 2root3 = 4root3

    Thats what I would have done - is that the correct answer?
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    The answer is 4root3 !
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    Oh I forgot I could do that to the denominator, I thought I had to get rid of it somehow.

    Yeah thats right thanks =)
 
 
 
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