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# Differentiation help watch

1. Hi I just wanted to know if i differentiate x= (y-1)/-2 does the -2 at the bottom be affected? Would dx/dy be - 1/2?
Thanks
2. (Original post by thequackingduck)
Hi I just wanted to know if i differentiate x= (y-1)/-2 does the -2 at the bottom be affected? Would dx/dy be - 1/2?
Thanks
yes
3. Cheers! There was me trying to differentiate the -2 too haha
4. How would i rearrange x^2 lnx = y to get x as the subject
I'm just unsure on how to get rid of the ln
5. (Original post by thequackingduck)
How would i rearrange x^2 lnx = y to get x as the subject
I'm just unsure on how to get rid of the ln
apply fallowing derivative formulas

d/dx (uv) = (u dv/dx ) + ( v du/dx )

d/dx x^n = n x^(n-1)

d/dx (ln x) = 1/x
6. (Original post by thequackingduck)
How would i rearrange x^2 lnx = y to get x as the subject
I'm just unsure on how to get rid of the ln
I do not think you can - are you sure that you need to
7. (Original post by thequackingduck)
How would i rearrange x^2 lnx = y to get x as the subject
I'm just unsure on how to get rid of the ln
You can't get x as the subject of that!

Why do you think you need to?
8. I guess I can't do that then haha no wonder it was hard lol
9. (Original post by thequackingduck)
I guess I can't do that then haha no wonder it was hard lol
Why were you trying?
10. How do i differentiate √9-y (all of it is square rooted) with the limits of 0 and 9
I can't believe that I'm stuck on this, I'm disappointed in myself. Thanks.
11. (Original post by thequackingduck)
How do i differentiate √9-y (all of it is square rooted) with the limits of 0 and 9I can't believe that I'm stuck on this, I'm disappointed in myself. Thanks.
That doesn't make sense! Are you trying to differentiate or integrate?
12. Oh sorry i meant integrate!! My bad!
13. (Original post by thequackingduck)
Oh sorry i meant integrate!! My bad!
Well do you know how to integrate with respect to y? It's exactly the same principle
14. Yeah but I've just forgotten that's the thing. I honestly don't know why ha, once I see the solution I'll be kicking myself lol
15. (Original post by thequackingduck)
Yeah but I've just forgotten that's the thing. I honestly don't know why ha, once I see the solution I'll be kicking myself lol
Well, what's the integral of for a start?
16. Sqrt(9-y)
Limits of 0 to 9
17. Any help?
18. (Original post by thequackingduck)
Any help?
You haven't answered my question yet

What's the integral of ?
19. The integral of a smiley face?!
20. (Original post by thequackingduck)
The integral of a smiley face?!
Are you actually going to do any work on this or have you stopped trying now?

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