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Thread: Surds help

  1. #1 Surds help 
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    Hello allI am currently re learning a specific maths syllabus as it's been a good decade since I last went over it. Part of it is surds. I'm working through some practise questions and one I'm stuck on is to simplify the following:-4 root 5 x 3 root 11Apologies for not using the root symbol but after reading the tutorial on tex I still have no idea how it works.Anyway, my problem with the above question is I can see anyway to simplify root 5 and root 11 any further.Can someone point me in the right direction?Kind regardsAnthony


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  3. #2  
    Forum Junior anticorncob28's Avatar
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    There is a rule in algebra stating that a^n*b^n = (ab)^n (this can easily be seen using the definition of exponents). Note that sqrt(x) = x^(1/2), so you can use this fact to deduce that sqrt(a)*sqrt(b) = sqrt(ab). Try to apply this to your case.


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  4. #3  
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    Thank you. Much appreciated. It was such a rookie overlook too!

    I'm having those moments with the basics at the minute. Earlier I missed the fact I had a top heavy fraction, and had to phone a friend!

    Anthony
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  5. #4  
    Forum Radioactive Isotope MagiMaster's Avatar
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    BTW, when you take the spaces out of the square brackets:

    [ tex ] 4 \sqrt{5} \cdot 6 \sqrt{7} [ /tex ]

    Becomes:



    Each "\something" generally becomes one symbol, with the curly braces used to group things (e.g. putting multiple things under one root sign).
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  6. #5  
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    Ah, so [tex] 4\sqrt{5} x 6\sqrt{7} [tex]

    Seems like a lot of effort
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  7. #6  
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    which didn't work. Damn.
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  8. #7  
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    Ah thank you very much. I'll have a play around with it later to try and get used to it.

    Will this tex only work on this particular forum? Or is it something that can be used it say microsoft word?

    All the best

    Anthony
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