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Math Help - Nth Term help

  1. #1
    Junior Member FB FTW's Avatar
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    Nth Term help

    n+3
    Write the first four terms using the nth term above.

    I dont even know where to start..
    And then theres these:

    Draw lines to match each nth term rule to its number sequence:


    TERMS Number sequences
    4n 4,7,12,19

    (n+1) 4,8,12,16

    n+3 4,9,16,25

    n(n+3) 4,10,18,28

    I dont know how to work out which ones match... (There not in the right order at the moment)

    HELP PLEASE
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  2. #2
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    Quote Originally Posted by FB FTW View Post
    n+3
    Write the first four terms using the nth term above.

    I dont even know where to start..
     {nth \;term, \;t_n} = n^3+3

    Put n = 1, 2, 3, 4, to get first term, second term, third term and fourth term respectively,

    first term t_1=(1)^3+3 = 1+3 = 4

    second term t_2=(2)^3+3 = 8+3 = 11

    third term t_3=(3)^3+3 = 27+3 = 30

    fourth term t_4=(4)^3+3 = 64+3 = 67

    so, first four terms are 4, 11, 30, 67

    Now, in the same way do the next part, and get first 4 terms and match it.
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  3. #3
    A riddle wrapped in an enigma
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    n+3
    Write the first four terms using the nth term above.

    I'm not really sure either, unless you are to substitute the first 4 counting numbers for n and solve for n^3+3

    If n={1, 2, 3, 4} then n^3+3={4, 11, 30, 67}

    I dont even know where to start..
    And then theres these:

    Draw lines to match each nth term rule to its number sequence:


    TERMS Number sequences
    4n 4,7,12,19

    If n={1, 3}, then 4n={4, 12}

    It could mean this. You could draw a line from 4n to 4 and 12. Sounds silly to me. I don't know.

    (n+1) 4,8,12,16

    n+3 4,9,16,25

    n(n+3) 4,10,18,28

    I dont know how to work out which ones match... (There not in the right order at the moment)

    HELP PLEASE[/quote]

    The instructions are too vague. See if you can get clarification or an example from your book or from class.
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  4. #4
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    Quote Originally Posted by FB FTW View Post
    [snip]
    Draw lines to match each nth term rule to its number sequence:


    TERMS Number sequences
    4n 4,7,12,19

    (n+1) 4,8,12,16

    n+3 4,9,16,25

    n(n+3) 4,10,18,28

    I dont know how to work out which ones match... (There not in the right order at the moment)

    HELP PLEASE
    Obviously 4n matches with the sequence 4,8,12,16 and (n+1) matches with the sequence 4,9,16,25. You can see this very easily simply by substituting the values n = 1, 2, 3 and 4 into each given rule and looking for a set of numbers that match.

    That leaves the other two for you to do in the same way.
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