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Math Help - How do you calculate this?

  1. #1
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    How do you calculate this?

    When I try to do it on my TI84 I got an error. Can I get some help please?
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: How do you calculate this?

    I get 87.4...on my TI-89 I entered:

    100+(-.84*15) [ENTER]

    87.4 (result)
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  3. #3
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    Re: How do you calculate this?

    Quote Originally Posted by MarkFL2 View Post
    I get 87.4...on my TI-89 I entered:

    100+(-.84*15) [ENTER]

    87.4 (result)

    I just plugged that in and got ERROR again. :-/
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  4. #4
    MHF Contributor MarkFL's Avatar
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    Re: How do you calculate this?

    Are you getting a syntax error? You may be using the minus key instead of the negate key in front of the .84.
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  5. #5
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    Re: How do you calculate this?

    Quote Originally Posted by MarkFL2 View Post
    Are you getting a syntax error? You may be using the minus key instead of the negate key in front of the .84.
    Yes, I am getting syntax error. What do I need to do to remove it? Or use the negate key. I have never used a calculator like this, so I am not familiar with it, sorry .

    NM, got it.
    Last edited by Past45; September 25th 2012 at 07:20 PM.
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  6. #6
    MHF Contributor MarkFL's Avatar
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    Re: How do you calculate this?

    Use the negate key...on my TI-89 it is to the left of the enter key, and is marked with (-). You use this to negate a number, whereas the minus key is used for subtraction. Try this and let me know if this works.
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