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Thread: Need you all to check and make sure I'm evaluating a function correctly.

  1. #1
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    Need you all to check and make sure I'm evaluating a function correctly.

    So my instructor stuck a couple of these questions into our exams and it says:

    Evaluate the function:

    1) Find f(-3) when f(x) =2x^2+3x+5....Do I just need to substitute -3 for the x's and see what I get?

    Also, I get a couple questions that says:

    Use synthetic division to determine f(-4), if:

    1) f(x)=4x^3+12x^2-8x+25....Is it just as simple as the previous question? I think that I only have to substitute -4 for the x's but it says to use synthetic division so I'm not sure!

    Thanks in advance!
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  2. #2
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    Re: Need you all to check and make sure I'm evaluating a function correctly.

    1. yes


    other #1 ...

    Code:
    -4]..........4.........12...........-8..........25
    ......................-16...........16.........-32
    ---------------------------------------------------
    .............4.........-4............8..........-7
    f(-4) = -7

    I recommend you research synthetic division if you are unfamiliar with the process.
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