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Math Help - Compass test

  1. #1
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    Compass test

    I'm trying to get into college. I'm really bad at math. Never even quite learned fractions,highschool drop out, and sleep in every highschool class. I don't know where in math I would really start. I really want to do good in this test, and have one week to study. They're going to have questions like this.


    • Evaluate 2x3 – x2 – 4in+ 2 at x = –3


    • I need to plug in "–3" for the "x", remembering to be careful with my parentheses and thenegatives:

      • 2(–3)3 – (–3)2 – 4(–3) + 2
        = 2(–27) – (9) + 12 + 2
        = –54 – 9 + 14
        = –63 + 14
        = –49

    I figured out everything except how 4(–3) + 2 gets turned into a positive. Sorry I copied and pasted and can't turn the bold off lol
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  2. #2
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    Re: Compass test

    note ...

    2(-3)3 - (-3)2 - 4(-3) + 2

    -4 times -3 is +12 , add 2 to get 14
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  3. #3
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    Re: Compass test

    oh thank you. I've been stuck on that.... Is there any easier way to add the (-3)3? because adding number when they get up there is just to crazy. there's no way on a test. Like if it's (12) powered by 14 or something. and I doubt they'll let me use a scientific calculator on the test.
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  4. #4
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    Re: Compass test

    Quote Originally Posted by dropkicksidekick View Post
    .... Is there any easier way to add the (-3)3? because adding number when they get up there is just to crazy. there's no way on a test. Like if it's (12) powered by 14 or something. and I doubt they'll let me use a scientific calculator on the test.
    if you mean (-3)3 , you are expected to know ...

    (1) that a negative number cubed is a negative, and

    (2) that 3 cubed is 27

    I really don't believe you need to worry about evaluating 1214
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  5. #5
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    Re: Compass test

    in elementary when they taught times tables, did they do the same concept with powered numbers in highschool?
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  6. #6
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    Re: Compass test

    so you automatically know what something cubed something is. and regular tests can you use scientific calculators?
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  7. #7
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    Re: Compass test

    Look up the rules for the test you're taking ... I can't say much about it since I'm not familiar with the test you're taking.
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