find the indicated derivative

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MissPiggy

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Feb 9, 2006
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The table lists the values of the functions f and g and their derivatives at several points. Use the table to find the indicated derivative.

nfjwqf.jpg


Find Dx(f[g(x)]) at x = 3.

a. -1
b. -3
c. 9
d. 3


I think the answer is -3, if not what should I do

"OINK oink" Miss Piggy
 
Have you met the Chain Rule?

Dx[f(g(x))] = f'(g(x))*g'(x)

That's all you need.
 
I got A, I am not sure if that is right, have tutor explain this to you better so you can understand
 
0 for 2 - If you would show your process, maybe one could point you in the right direction, too.
 
tutorgirl said:
I got A, I am not sure if that is right, have tutor explain this to you better so you can understand
Click to expand...

Who was this person?
 
MissPiggy said:
now I am more confused. Can you tell me what I need to do I am confused
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You've already been told what you "need to do": apply the Chain Rule.

You got an answer, so you must have done some sort of steps using some sort of reasoning. We can't help you find errors until you tell us what those steps and reasoning were.

(Either that, or you randomly guessed a letter, in hopes of being told the correct option to circle. It should be noted that this sort of technique has been much overused here of late, and the tutors aren't generally giving out the answers any more. Sorry.)

Please reply showing all of your work. Thank you.

Eliz.
 
mybe she doesnt understand. why dont you just let tk help all of those they started helping instead of confusing people even more!
 
isabelle2hot said:
mybe she doesnt understand. why dont you just let tk help all of those they started helping instead of confusing people even more!
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I'm sorry if I offended you by pointing out the assistance that tkhunny had already provided, but this was meant to answer the student and clear up the stated confusion.

It should also be noted that no tutor "owns" any one thread or student; other tutors are allowed to chime in.

Thank you for your consideration.

Eliz.
 
I heartily endorse replies by stapel. She has a broad background in education and internet tutoring. You should be quite pleased to have such intervene on your behalf. If you wait for just me, you could wait for quite a while.

Look back up to the top - my first reply. Try to relate this to your chart. Show what you determine.
 
No, but I really cannot tell you if that is close, since you still didn't demonstrate what you did.

Let's back up a bit.

What is g(3), according to your chart?
 
No.

Follow the g(x)-row across to the 3-column. What value is at the intersection?
 
Great. Now do the same for g(3). Once you find that value, call it 'p', find f'(p) and you will almost be done.
 
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