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# C4 Implicit functions

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1. Hi can someone show me where i am going wrong with these?

Find the gradient of the stated curve at the specified point.

2C) at the point

I differentiate to get:

I get on its own.

I sub the values in and get , however the answer in my book says it is .
2. Nvm yh I got same as you.
3. Book's wrong.
4. I won't lie I get the same as you. Are you sure that you have the right equation and point?
5. I agree with your answer; it is 7/28= 1/4.

Book is wrong.
6. (Original post by 0range)
I think it should be -7y^2
What?

7. (Original post by f1mad)
What?

lol nah its nothing i forgot to put a minus when doing the product rule on the -7xy^2
8. (Original post by 0range)
Nvm yh I got same as you.

(Original post by ghostwalker)
Book's wrong.

(Original post by miss katie)
I won't lie I get the same as you. Are you sure that you have the right equation and point?
Yeah, i doubled checked the question, i've spent over an hour on this question .
(Original post by f1mad)
I agree with your answer; it is 7/28= 1/4.

Book is wrong.
Ok thanks guys

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