You are Here: Home >< Maths

# Confused with differentiations? watch

1. How do you do these?

Differentiate with respect to x:

a) x^4

b) x^7/2

c) 6

h) 17.8

Is a= 4x^3
2. (a) is correct. Repeat the pattern. Constants have a rate of change of zero.
3. How will you do it for whole numbers though?

Also is x^7/2: 3.5x^2.5?
4. general rule is x^n = nx^n-1
5. (Original post by Deep456)
Furthermore do I need to put:

dy/dx (x^4) = 4x^3
No, technically what you want is but at this level you can just write y = x^4, then dy/dx = 4x^3.
6. (Original post by Deep456)
How will you do it for whole numbers though?

Also is x^7/2: 3.5x^2.5?
Yeah that is right, and I would recommend writing dy/dx each time yeah, so as not to get confused when using more numbers and differentials.
7. (Original post by benwellsday)
No, technically what you want is but at this level you can just write y = x^4, then dy/dx = 4x^3.
Any help on doing whole numbers though?
8. (Original post by Deep456)
Any help on doing whole numbers though?
Differentiating whole numbers? Yes, they become 0, here's one way of thinking about it.

so y = 8

But in general you just differentiate them to 0 straight away.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: January 28, 2009
Today on TSR

Uni realities

### University open days

• University of Lincoln
Mini Open Day at the Brayford Campus Undergraduate
Wed, 19 Dec '18
• University of East Anglia
Fri, 4 Jan '19
• Bournemouth University
Wed, 9 Jan '19
Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams