Help with Test Q: What is fg'(3)?

[JoshuaC]

Hello!

I have a question from a test that I wasn't sure about, so I guessed.

The question is:

f(3)= 5
g(3)= -4
f'(3)= 1.1
g'(3)= .7

What is fg'(3)

Answer choices: a) .9 b) .4 c) -.9 d) -.4

Does anyone know the answer? And how did you get it?

Help would be much appreciated. Thanks!

 

[johnqwertyful]

Do you mean (fg)'(3)?

Also, homework help forum.

Also (fg)'=fg'+gf'
So just plug in what they gave.

 

[berkeman]

Hello!

I have a question from a test that I wasn't sure about, so I guessed.

The question is:

f(3)= 5
g(3)= -4
f'(3)= 1.1
g'(3)= .7

What is fg'(3)

Answer choices: a) .9 b) .4 c) -.9 d) -.4

Does anyone know the answer? And how did you get it?

Help would be much appreciated. Thanks!

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