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Math Help - Surds Help

  1. #1
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    Surds Help

    I really need help for this and this is my first time on this website so sorry if its in the wrong category
    Sorry in advance for some of the questions, they were typed off the sheet. And if you could show your working out that would be great


    Q1. So that any digit from 0 to 9 can be displayed on a scoreboard, tube lighting is set up on a digital clock style

    If each individual section of tubing is (3√2-2) metres in length, what exact length of tubing would be lit to produce the following digits? (Make sure in each case that you expand out any brackets in your answer and keep it in surd form)

    Q2. Find the exact area of the following shape. (Make sure you expand any brackets in your answer and keep it in surd form)

    Top length. (√5 + 6)cm and the side length is 2√7cm.
    Last edited by mr fantastic; February 15th 2011 at 01:35 AM. Reason: Excess questions deleted.
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  2. #2
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    Quote Originally Posted by Ggcux View Post
    Q1. So that any digit from 0 to 9 can be displayed on a scoreboard, tube lighting is set up on a digital clock style

    If each individual section of tubing is (3√2-2) metres in length, what exact length of tubing would be lit to produce the following digits? (Make sure in each case that you expand out any brackets in your answer and keep it in surd form)
    What digits?
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  3. #3
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    Sorry for not specifying it, but the normal digits of a digital clock, so 5 would have 5 little lights lit up, 8 would have 7, 0 would have 6 and 4 would have 4
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  4. #4
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    So all digits one to nine.

    Ok, well 'zero' has six metres of tubing so \displaystyle 6\times (3\sqrt{2}-2) = 6\times 3\sqrt{2}-6\times 2 = 18\sqrt{2}-12

    Now you have a go at 'one'
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