anonymous
  • anonymous
How would I solve this problem: (problem attached)
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
The integral of that curve, f' over any interval will tell you the increase or decrease of f. If it's area above the axis, that's an increase of f. If it's area below the axis, that's a decrease of f. The important places to check f are the endpoints and wherever f' is 0.
anonymous
  • anonymous
Also since is the graph of the derivative, look at the zeros and where this graph of the derivative changes from a + to a neg (Like Smoothmath said) Don't forget the initial value also.

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anonymous
  • anonymous
haha... that looks like a sample AP exam question...
anonymous
  • anonymous
Yup. I'm teaching AP calc at the moment, and I just gave my students this problem as review before the AP test.
anonymous
  • anonymous
the test is this Wednesday?
anonymous
  • anonymous
Haha yes.
anonymous
  • anonymous
When I added the negative and positive values I came up with: 20-6+4=18, then I added the initial 2, but that gives me 20 and it says the answer is 22
anonymous
  • anonymous
That's the integral over the WHOLE interval, which means it ends up there, at 20. Perhaps it gets further at an earlier time?
anonymous
  • anonymous
that's because the question is asking what is the maximum f will get in the interval. your answer is at the end of the interval.
anonymous
  • anonymous
Look at other intervals and ask yourself where the partical is at those times.
anonymous
  • anonymous
Wait is it 22 because the largest area is 20 and adding the initial 2 gives 22 as the answer?
anonymous
  • anonymous
@SmoothMath @dpaInc
anonymous
  • anonymous
Oh, sorry it didn't notify me. Yeah, it's 22. You need to check at each value that the derivative is 0.
anonymous
  • anonymous
So I just find the largest value where the derivative is 0 and add the initial value on, right?
anonymous
  • anonymous
|dw:1336438693557:dw|
anonymous
  • anonymous
Notice the points that I checked f at. The endpoints, and every point where f'=0.
anonymous
  • anonymous
So, just 20+2?
anonymous
  • anonymous
Right.
anonymous
  • anonymous
Thank you!

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