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    jxaxbx's Avatar
    jxaxbx Posts: 1, Reputation: 1
    New Member
     
    #1

    Jul 15, 2008, 04:28 PM
    Missing values in a function table
    Hello,

    Here is my table:

    x
    1
    2
    3
    missing value
    missing value
    6

    y corresponds with the appropriately (I just can't make the table in this format)
    8
    14
    missing value
    24
    28
    missing value
    Can anyone help me find the rule so that I can figure out the missing values?

    Thank you!
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
    Expert
     
    #2

    Jul 16, 2008, 06:05 AM
    If you assume that the missing values for the x variable are 4 and 5 (which looks reasonable), then you can fit a quadratic to the values

    x1,y1 = 1,8
    x2,y2 = 2, 14
    x4,y4 = 4, 24.

    So you end up with 3 equations in 3 unknowns based on y = Ax^2 + Bx +C.

    Like this:

    A(1^2) + B*1 + C = 8
    A(2^2) + B*2 + C = 14
    A(4^2) + B*4 +C = 24

    Solve for A, B, and C, and check with the other value you are given: f(5) = 28, to double check that this works. You can then find the missing values for y for x = 5 and x=6. Hope this helps.

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