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# C1 Differentiation Watch

1. Hi, there's a few questions which I'm stuck on. How would I approach question 5 part 3 and for question 13 part 3B. I've made the two equations equal to each other, but can't seem to solve it. Thanks
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2. (Original post by candyhearts)
Hi, there's a few questions which I'm stuck on. How would I approach question 5 part 3 and for question 13 part 3B. I've made the two equations equal to each other, but can't seem to solve it. Thanks
How is the gradient of the tangent related to y = f(x)?
3. (Original post by joostan)
How is the gradient of the tangent related to y = f(x)?
The tangent's gradient would be -2 and so would the gradient of the curve?
4. (Original post by candyhearts)
The tangent's gradient would be -2 and so would the gradient of the curve?
Good How would you find the gradient of the curve if you didn't have the normal though?
5. (Original post by joostan)
Good How would you find the gradient of the curve if you didn't have the normal though?
Oh, so you just differentiate and make that equal to 1/2 and then find out the two solutions?
6. (Original post by candyhearts)
Oh, so you just differentiate and make that equal to 1/2 and then find out the two solutions?
You differentiate and set that equal to -2 => The gradient of the curve.
7. (Original post by joostan)
You differentiate and set that equal to -2 => The gradient of the curve.
Oh yeah, -2 my bad. Thank you very much
8. (Original post by candyhearts)
Oh yeah, -2 my bad. Thank you very much
No problemo

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