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Math Help - Graphing??

  1. #1
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    Graphing??

    Nobody in my class gets this stuff, I have no idea what the heck the teacher is explaining..

    -It's increasing/decreasing behavior, critical points, relative extrema
    -concavity and points of inflection
    -Vertical, Horizontol, and slant asymptotes
    -use the info to sketch the curve, use tables for f' and f''

    1.x^4 - 4x^3 +16x

    I found the vertical asymptote is 2.. But how do I find the slant asymptote? There's no other factor to use long division to find it..

    2.3x^(2/3) - 2x

    4. (x^2+1)/(x^2-2)
    I found the H.A. is 1.. How do I find the V.A(The denominator is never zero..)
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by elpermic View Post
    increasing/decreasing behavior
    a function is increasing on the interval where its derivative is positive, and decreasing where it is negative


    critical points
    these are the points where either the derivative is zero, or the function is undefined

    relative extrema
    these occur where the derivative is zero. they can be maximums, minimums or inflection points. the second derivative test can tell you which.

    -concavity and points of inflection
    a function is concave up on the interval its second derivative is positive

    a function is concave down on the interval its second derivative is negative


    if the second derivative is zero at a point, then it MIGHT be an inflection point. further tests are needed.

    you can test for an inflection point in one of to ways:

    (1) using the first derivative: the the sign of the derivative changes on either side of the said point, then it is not an inflection point. test points very close to the point you are considering.

    (2) using the second derivative: if the second derivative changes sign on either side of the point, then it is an inflection point

    -Vertical, Horizontol, and slant asymptotes
    vertical asymptotes occur where the function is undefined.

    horizontal asymptotes occur if either of the following limits are finite. if they are finite, then the horizontal asymptote is the value of the limit

    \lim_{x \to \infty}f(x) and \lim_{x \to - \infty}f(x)

    you have to do both limits. you can have up to two horizontal asymptotes

    -use the info to sketch the curve, use tables for f' and f''

    1.x^4 - 4x^3 +16x

    I found the vertical asymptote is 2.. But how do I find the slant asymptote? There's no other factor to use long division to find it..
    obviously we are not looking at the same function here, or you typed something wrong. the function above is a polynomial, there are no asymptotes.

    2.3x^(2/3) - 2x

    4. (x^2+1)/(x^2-2)
    I found the H.A. is 1.. How do I find the V.A(The denominator is never zero..)
    right for the HA. for the VA, you are wrong. there are two points where x^2 - 2 = 0
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