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Math Help - Calculus I easy question?

  1. #1
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    Calculus I easy question?

    My calculus teacher gives us online quizzes about the material we are supposed to learn the next day. This is only the first week. Here is the question:

    Compute.

    lim ((x^2)-9x+2)
    x->5
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  2. #2
    Super Member 11rdc11's Avatar
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    Just plug in 5 for x and it will give you your limit
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  3. #3
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    so the answer is -18?
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by thecount View Post
    so the answer is -18?
    yes
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  5. #5
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    heres the second question. i did the same thing but you cannot divide by zero, so what's the answer here?

    lim ((x^4)-16)/(x-2)
    x->2
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  6. #6
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    Hint: Factor the numerator as much as possible. x^4 - 16 = \underbrace{{\color{red}(x^2 - 4)}(x^2 + 4)}_{\text{By Difference of Squares}} = \hdots

    Factor the red by the difference of squares and see what cancels Then try to evaluate
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