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Math Help - How to calculate

  1. #1
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    How to calculate

    Use calculator - answer correct to 3 places.


    2√11 - 3√2 + 15√10 + 5√5 = How would I punch this into calculator? If I type it in as it is, it says "domain error"

    (3√17 + 2√15)/5√7 = How to punch this in calc.


    2/17 + 3/19 - 1/7 = How to punch this in calc. Do I need to bracket each fraction or type as it is?

    Thanks for helping!
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  2. #2
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    Read the manual. We can't tell
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  3. #3
    Junior Member slovakiamaths's Avatar
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    Use calculator - answer correct to 3 places.

    2√11 - 3√2 + 15√10 + 5√5
    sol :first of all you have to do the squareroot of 11=3.317
    then multiply it with 2,we get 2√11=6.634

    similarly find 3√2,15√10,5√5
    now put these values in
    2√11 - 3√2 + 15√10 + 5√5=6.334-4.243+47.434+11.180
    =61.005
    similarly you can do other parts
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  4. #4
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    What type of calculator are you using? I assume it is a graphing calculator.

    Generally you need to put parentheses around what you are taking the root of. You might also need the multiplication sign. So #1 equals:

    2*√(11) - 3*√(2) + 15*√(10) + 5*√(5)

    The same holds for #2, which equals

    (3*√(17) + 2*√(15))/5*√(7)

    You do not need brackets for the fractions in #3 because division comes before addition in the order of operations. So the way you wrote it is fine.
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  5. #5
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    Thanks for the suggestions Ragnarok and slovakiamaths! Appreciate it.
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