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    mooreks66's Avatar
    mooreks66 Posts: 1, Reputation: 1
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    #1

    Mar 10, 2007, 01:04 PM
    Functions, lines and slopes
    I am having difficulty with functions. Not understanding how to solve, how to determine the number that goes for x. here's the question, please help if you can:

    f(x) = 3x(2x - 1). f(-1) =

    1. I don't understand why the period (.) is there.
    2. I substituted -1 for x but could not come up with an answer that was available out of my 4 choices.

    a. 7
    b. 11
    c. -6
    d. 9

    please help and explain the process.
    thanks
    nightal1031's Avatar
    nightal1031 Posts: 9, Reputation: 1
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    #2

    Mar 10, 2007, 01:09 PM
    you sub in -1 for all x values in the equation.

    3(-1) (2(-1) -1) start by subbing in -1 for all of the x values in the equation..
    -3 (-2 - 1) multiply 3 and 2 by -1.
    -3 (-3) following the order of operations, you do what is in the parentheses first.
    9 multiply -3 by -3, and you get 9.
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