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Math Help - Need help. Simple exponent question.

  1. #1
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    Need help. Simple exponent question.

    -2^4+3^-1

    Okay so here it is, feel kind of stupid but havent done any math since the beginning of my grade 12 year :/ and just started a university math course for my IT degree sort of thing

    Need to simplify it into the form *A/b* a and b both being integers

    It HAS to be simple and for some reason i just dont get it. I understand the rest of the more complicated stuff in the chapter just stuck on this.

    The answer key says it should be -47/3 could be a wrong answer in the back but who knows :S
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  2. #2
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    Quote Originally Posted by Djaevel View Post
    -2^4+3^-1

    Okay so here it is, feel kind of stupid but havent done any math since the beginning of my grade 12 year :/ and just started a university math course for my IT degree sort of thing

    Need to simplify it into the form *A/b* a and b both being integers

    It HAS to be simple and for some reason i just dont get it. I understand the rest of the more complicated stuff in the chapter just stuck on this.

    The answer key says it should be -47/3 could be a wrong answer in the back but who knows :S
    I'm assuming you understand that 2^4 = 16 , the negation sign just changes its sign.

    note that a^{-b} = \frac{1}{a^b}
     <br /> <br />
-2^4 + 3^{-1} = -16 + \frac{1}{3^1} = -\frac{48}{3} + \frac{1}{3} = ...<br />
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  3. #3
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    Oh WOW i got as far as the -16+(1/3^1) and didnt even think of making the denominators the same :| durrr.

    Thanks a ton.
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