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# Oh this bloody quotient rule - HELP! watch

1. Hi all,

I would appreciate if someone could solve this problem for me.

I got it from the textbook, so I have the answer, but I can't get how to arrive to it.

Please upload the solution in word, pdf or jpg format (via paint or photoshop)

Much obliged.

I hate my maths revision.
Attached Images

2. (Original post by the_13th)
Hi all,

I would appreciate if someone could solve this problem for me.

I got it from the textbook, so I have the answer, but I can't get how to arrive to it.

Please upload the solution in word, pdf or jpg format (via paint or photoshop)

Much obliged.

I hate my maths revision.
I see no problem? ...

Edit: Ah I see it now.

Edit 2: Scratch all of that.
3. (Original post by the_13th)
Hi all,

I would appreciate if someone could solve this problem for me.

I got it from the textbook, so I have the answer, but I can't get how to arrive to it.

Please upload the solution in word, pdf or jpg format (via paint or photoshop)

Much obliged.

I hate my maths revision.
Well post your working and we will see where you've gone wrong.
4. (Original post by laughylolly)
I see no problem? ...

Edit: Ah I see it now.

You can simplify the rest....

What is the answer in the text book? I think my method is right...
Hmmm... doesn't look like that.

That's the textbook's answer/
Attached Images

5. (Original post by laughylolly)
I see no problem? ...

Edit: Ah I see it now.

You can simplify the rest....

What is the answer in the text book? I think my method is right...
I think we must use quotient rule since the question says "using quotient rule find dy/dx"
6. Don't you have to divide by 'v^2' for quotient rule...?
7. (Original post by laughylolly)
Working above ^ ^ don't know if you have seen it.

My simplified answer is :

This could be completely wrong though...
I can't judge really.

I have tried to solve this probelm 3 times and I get a different answer every time (but never the right one).

The answer from the textbook is in my previous message - check it.
8. (Original post by TheDustyKid)
Don't you have to divide by 'v^2' for quotient rule...?
yes, you do. I still get wrong answers.
9. (Original post by laughylolly)
I see no problem? ...

Edit: Ah I see it now.

You can simplify the rest....

What is the answer in the text book? I think my method is right...
You've gone wrong in your second line. You can't multiply the brackets like that, if you've got the power of -1 in there.

10. Can you finish it off?
11. Just did it now on paper and the answer given in the book is right.
12. (Original post by the_13th)
Hi all,

I would appreciate if someone could solve this problem for me.

I got it from the textbook, so I have the answer, but I can't get how to arrive to it.

Please upload the solution in word, pdf or jpg format (via paint or photoshop)

Much obliged.

I hate my maths revision.
OK there is a lot of confusion here.

Start by distributing the square root into both the numerator and denominator so you end up with one nice fraction. Now apply the quotient rule.
13. I managed to get it out.
14. (Original post by F1Addict)
Just did it now on paper and the answer given in the book is right.
can you upload a picture of your paper with the solution? I'm stuck.
15. (Original post by Pheylan)

Can you finish it off?
I forget, is implicit differentiation taught before or after quotient rule? Your method is much more elegant and is probably best for avoiding algebraic errors.
16. (Original post by laughylolly)
Scratch that. Sorry I've never done this rule before but I thought I would give it a go. Looked it up and I agree with the 11 on top from the textbook answer but on the bottom I got (2x+5)^2

Why the neg? Sorry for trying...
hahaha, it wasn't from me. Thanks for trying.
17. (Original post by coldfusion)
I forget, is implicit differentiation taught before or after quotient rule? Your method is much more elegant and is probably best for avoiding algebraic errors.
It's definitely something I've not been taught.
18. (Original post by the_13th)
It's definitely something I've not been taught.
Is this A2 Maths?
19. (Original post by laughylolly)
Is this A2 Maths?
IB SL
20. (Original post by the_13th)
It's definitely something I've not been taught.
In that case you have to do it the hard way, ie my way lol. Be sure to be very careful with the roots and powers.

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