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Math Help - Evaluate this function

  1. #1
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    Evaluate this function

    evaluate this function F(x)= 2[[x+7]]-8 at the indicated values:

    i) f(3)
    ii) f(-3.3)
    iii) f(3/4)

    i dont know why when i plug in ii) and iii) i dont get the right answer. when i plug in i) f(3) i get 12 which is the correct answer for that values but the other two is way off. what should i do?
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  2. #2
    Super Member redsoxfan325's Avatar
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    Quote Originally Posted by refresh View Post
    evaluate this function F(x)= 2[[x+7]]-8 at the indicated values:

    i) f(3)
    ii) f(-3.3)
    iii) f(3/4)

    i dont know why when i plug in ii) and iii) i dont get the right answer. when i plug in i) f(3) i get 12 which is the correct answer for that values but the other two is way off. what should i do?
    -3.3+7=3.7, so [[3.7]]=3 and 2\cdot3-8=-2
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  3. #3
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    Quote Originally Posted by redsoxfan325 View Post
    -3.3+7=3.7, so [[3.7]]=3 and 2\cdot3-8=-2
    i dont understand how [[3.7]] is 3?
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  4. #4
    Super Member redsoxfan325's Avatar
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    Is that not the greatest integer (floor) function?
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  5. #5
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    Quote Originally Posted by redsoxfan325 View Post
    Is that not the greatest integer (floor) function?
    ok so for [[3/4+7]] would that be 4????
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