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# differentiation by first principle fp1 Watch

1. Completely forgot where and how to start this. if someone could help me out with a method and explanations i would really appreciate it
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2. (Original post by Mitul106)
Completely forgot where and how to start this. if someone could help me out with a method and explanations i would really appreciate it
What happens when you sub in into your equation? What y coordinate does that get you? You now have two points, can you find the gradient in terms of h? hint: change in y over change in x.
3. (Original post by Mitul106)
Completely forgot where and how to start this. if someone could help me out with a method and explanations i would really appreciate it
It's probably best if you read this in a book / watch a video.

I recommend this video.
4. (Original post by Mitul106)
Completely forgot where and how to start this. if someone could help me out with a method and explanations i would really appreciate it
Sketch Sketch

and remember

also remember the gradient or the change in y over the change in x =
5. When you're doing these questions, the question will pretty much always ask you to give the gradient of the chord in terms of h, then they will ask you for the gradient as which of course is the gradient of the curve at that point.

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