# Calculus problem, I don't understand what it means?

Dx(7x+2-3x5)

CNXN-1?

## The Attempt at a Solution

Basically, I am in Physics C and this is our first homework assignment dealing with calculus/derivatives. I was able to do some of them, but I have no idea how to do this one, mainly because I don't know what to do with the Dx.

To make sure I am on the right track, please tell me if this is the correct answer for another problem:

Problem: f(x) = -5x2+2x-1, find df/dx

And my answer is -10x + 2, using the power rule. Is that right?

Related Calculus and Beyond Homework Help News on Phys.org
tiny-tim
Homework Helper
… power rules ok!

Hi dominus96!
To make sure I am on the right track, please tell me if this is the correct answer for another problem:

Problem: f(x) = -5x2+2x-1, find df/dx

And my answer is -10x + 2, using the power rule. Is that right?
Completely!
… mainly because I don't know what to do with the Dx.
Dx is just another way of writing d/dx.

Just use the power rule again … which, as you say, is:
CNXN-1

Thank you very much tiny-tim. If you don't mind, I have one more similar problem that is also written in a way I don't understand. Here it is:

Find f' for f(x) = 11x - 2.

Is f' (f prime) basically the first derivative again, or different?

tiny-tim
Homework Helper
Find f' for f(x) = 11x - 2.

Is f' (f prime) basically the first derivative again, or different?
Yup … same thing!

(the advantage of the ' notation is that it's much easier to type f'' and f''' and so on! )

HallsofIvy