An archived instance of a Calc I forum

Geometry of your personal function

mark

(10 pts)

For this problem, you’re going to answer some questions concerning the first and second derivative of a graph build just for you. To get your graph, enter your name below. Once you have your graph, you can enter some points (just the x-coordinates) that you’d like plotted and automatically on the graph. You’ll want to choose those points to indicate maxima, minima, and inflection points. This should help you answer the questions below.

Once you have your labeled graph, you save and download it so that you can respond with the image of your labeled graph and the answers to the following:

  1. Identify intervals on which f' > 0.
  2. Identify intervals on which f' < 0.
  3. Identify intervals on which f'' > 0.
  4. Identify intervals on which f'' < 0.
mbradle7

graph

  1. f' > 0 for the intervals: (-2.2, -1) and (1,∞)
  2. f' < 0 for the intervals: (-∞, -2.2) and (-1, 1)
  3. f'' > 0 for the intervals: (-∞, -1.5) and (0, ∞)
  4. f'' < 0 for the intervals: (-1.5, 0)
cmoore14
  1. f' > 0 on (-2.5, -1.15) and (0.75, \infty)
  2. f' < 0 on (-\infty, -2.5) and (-1.15, .75)
  3. f'' > 0 on (-\infty, -1.9) and (-0.1, \infty)
  4. f'' < 0 on (-1.9, -0.1)
chowell1
  1. f' > 0 on (-2.6, -1.4) and (0.5, \infty)
  2. f' < 0 on (-\infty, -2.6) and (-1.4, 0.5)
  3. f'' > 0 on (-\infty, -2.1) and (-0.37, \infty)
  4. f'' <0 on (-2.1, -0.37)

graph (1)

mearing

  1. f'>0 on intervals (-2.25,-1.25) and (.75, \infty)
  2. f'<0 on intervals (-\infty,-2.25) and (-1.25,.75)
  3. f''>0 on intervals (-\infty,-1.75) and (-.25,\infty)
  4. f''<0 on interval (-1.75,-.25)
lliberty
  1. f' > 0 for (-2.37,-1.25) and (0.6, \infty)
  2. f' < 0 for (- \infty,0.6) and (-1.25,0.6)
  3. f'' > 0 for (- \infty,-2) and (-0.25, \infty)
  4. f'' < 0 for (-2,-0.25)
    My graph:
    graph
sbindas

graph

1. (-2.3, -1.05), (0.95, \infty)
2. (-\infty, -2.3), (-1.05, 0.95)
3. (-\infty, -1.7), (0.1, \infty)
4. (-1.7, 0.1)

rserra

  1. f'>0 on (-2.25,-1.14) and (0.74,\infty).
  2. f'<0 on (-\infty,-2.25) and (-1.14,0.74).
  3. f''>0 on (-\infty,-1.7) and (-0.1,\infty).
    4.f''<0 on (-1.7,-0.1).
jbarry1

Here’s the labelled graph of my function:

1.f^{\prime }>0 on (-2.8, -1.5) and (0.45,\infty)
2.f^{\prime }<0 on (-\infty, -2.8) and (-1.5, 0.45)
3.f">0 on (-\infty, -2.15) and (-0.5, \infty)
4.f"<0 on (-2.15, -0.5)

cmarsha4

  1. f’ > 0 on (-2.7, -1.2) and (1.8, infinity)
  2. f’ < 0 on (-infinity, -2.7) and (-1.2, 1.8)
  3. f" < 0 on (-infinity, -2.3) and (-0.4, infinity)
  4. f" > 0 on (-2.3, -0.4)
bserra

  1. f'(x) > 0 on (-2.5, -1.48) and (0.95, ∞),
  2. f'(x) < 0 on (-∞, -2.5) and (-1.48, 0.95),
  3. f''(x) > 0 on (-∞, -1.98) and (-0.2,∞ ), and
  4. f''(x) < 0 on (-1.98, -0.2)
nevers

Calc Graph.jpeg
f’ > 0 (-2.31, -.98) and (.95, infinity)
f’ < 0 (-infinity, -2.31) and (-.98, .95)
f’’ > 0 (-infinity, -1.53) and (.19, infinity)
f’’ > 0 (-1.53,.19)

dkey

graph

  1. f'>0 when (-2.8, -1.5) (0.5, ∞)
  2. f'<0 when (-∞, -2.8) (-1.5, 0.5)
  3. f''>0 when (-∞, -2.1) (-0.4, ∞)
  4. f''<0 when (-2.1, -0.4)
abjorkma

Here is the labeled graph of my function:

  1. f^{\prime }>0 on \left(-2.6,-1\right) and \left(1.1,\infty \right)
  2. f^{\prime }<0 on \left(-\infty ,-2.6\right) and \left(-1,1.1\right)
  3. f^{''}>0 on \left(-\infty ,-1.9\right) and \left(0.1,\infty \right)
  4. f^{''}<0 on \left(-1.9,0.1\right)
mwilli21

This is the graph of my function labeled:

I think my intervals are as follows:

  1. f'>0
\left(-2.85,-1.20\right),\left(0.84,\infty \right)
  1. f^{\prime }<0
\left(-\infty ,-2.85\right),\left(-1.20,0.84\right)
  1. f''>0
\left(-\infty ,-2.05\right),\left(-0.1,\infty \right)
  1. f''<0
\left(-2.05,-0.1\right)
mabbott

  1. f' > 0 for the intervals: (-2.6, -1.28) and (0.89, \infty)
  2. f' < 0 for the intervals: (-\infty, -2.6) and (-1.28, 0.89)
  3. f'' > 0 for the intervals: (-\infty, -1.94) and (-0.1, \infty)
  4. f'' < 0 for the intervals: (-1.94, -0.1)
mark

@abjorkma,@dkey,@nevers,@cmarsha4,@sbindas

Please use the mathematical typesetting tools as described in this meta post.

jlytle2

acole6

  1. f' > 0 for the intervals: (0.5, -\infty) and (-2.6, -1.1)
  2. f' < 0 for the intervals: (-\infty, -2.6) and (-1.1, 0.5)
  3. f" > 0 for the intervals: (-\infty, -2) and (-0.25, \infty)
  4. f" < 0 for the intervals: (-1.7, -0.4)
afuson

graph

  1. f '> 0\ for\ the\ intervals: (-2.2,-1) \ and \ (0.7,\infty)
  2. f '< 0\ for\ the\ intervals: (-\infty,-2.2) \ and \ (-1.1,0.7)
  3. f ''> 0\ for\ the\ intervals: (-\infty,-1.5) \ and \ (-0.1,\infty)
  4. f ''< 0\ for\ the\ intervals: (-1.5,-0.1)