# Product rule, help please!Watch

Thread starter 2 years ago
#1
6) f(x) ≡ x^3/2 (x − 3)^3 , x > 0
a) Show that f ′(x) = k x^1/2 (x − 1)(x − 3)^2 , where k is a constant to be found.

The closest thing I have is (3x^1/2 (x-3)^2)/2 * [(x+3)(x-1)]
0
reply
2 years ago
#2
The way I remember the product rule is that you differentiate one and leave the other one and then put a + and then do the opposite (so differentiate the one you didn't and leave the one you did)
You have to also remember that you also have to use the chain rule in this question
0
reply
Thread starter 2 years ago
#3
(Original post by FutureMedic97)
The way I remember the product rule is that you differentiate one and leave the other one and then put a + and then do the opposite (so differentiate the one you didn't and leave the one you did)
You have to also remember that you also have to use the chain rule in this question

Posted from TSR Mobile
Here's a photo of my working out:
0
reply
2 years ago
#4
(Original post by TheGreatPumpkin)
Posted from TSR Mobile
Here's a photo of my working out:
Simplify what you have in the square brackets, and then you'll be able to take out a factor.
reply
X

Write a reply...
Reply
new posts
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• University of the Arts London
MA Performance Design and Practice Open Day Postgraduate
Thu, 24 Jan '19
• Brunel University London
Undergraduate Experience Days Undergraduate
Sat, 26 Jan '19
• SOAS University of London
Postgraduate Open Day Postgraduate
Sat, 26 Jan '19

### Poll

Join the discussion

#### Are you chained to your phone?

Yes (73)
19.11%
Yes, but I'm trying to cut back (155)
40.58%
Nope, not that interesting (154)
40.31%

View All
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.