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# Differentiation Watch

1. (Original post by _Xenon_)
Is the other one negative? So (-2,-8)
yes
2. (Original post by Zacken)
Yep! Well done.
Thanks so is the 2 really + or - 2 then the 2 coordinates are positive (2,8) and negative (-2,-8)
3. (Original post by samb1234)
yes
Thanks ^
4. (Original post by _Xenon_)
Thanks so is the 2 really + or - 2 then the 2 coordinates are positive (2,8) and negative (-2,-8)
Basically, you had the equation which has solutions . The corresponding y-values are (2)^3 = 8 and (-2)^3 = -8.

Hence one point is and the other is . (i.e: there are two points with the same gradient) Does that answer your question? I'm not sure what you're asking.
5. multiply by the power and reduce the power by 1
6. (Original post by thefatone)
multiply by the power and reduce the power by 1
...dude, what?
7. (Original post by Zacken)
...dude, what?
8. The way I learnt it was basically you multiply the multiplier of X by the power and take 1 away from the power. If there is no power then the X completely cancels out, and if there is no X, then the number completely cancels out, so 2X^3= 6X^2, x^2= 2X, -8X= -8, and 3 cancels out.
This means that dy/dx=6X^2+2X-8
I don't really get why it works, I just know that's what you do XD
9. (Original post by thefatone)
multiply by the power and reduce the power by 1
Yes I understood that bit already I'm now trying harder examples
10. (Original post by Zacken)
Basically, you had the equation which has solutions . The corresponding y-values are (2)^3 = 8 and (-2)^3 = -8.

Hence one point is and the other is . (i.e: there are two points with the same gradient) Does that answer your question? I'm not sure what you're asking.
Hi yes that makes sense!
11. (Original post by _Xenon_)
Yes I understood that bit already I'm now trying harder examples

12. (Original post by _Xenon_)
Hi yes that makes sense!
Awesome.
13. (Original post by thefatone)

No I don't know fractions one please explain it. :-)
EDIT: I don't think I need to know that type for my exam, not sure.
14. (Original post by _Xenon_)
No I don't know fractions one please explain it. :-)
EDIT: I don't think I need to know that type for my exam, not sure.
Its exactly the same process
15. (Original post by _Xenon_)
No I don't know fractions one please explain it. :-)
EDIT: I don't think I need to know that type for my exam, not sure.
oh

multiply
16. (Original post by samb1234)
Its exactly the same process
oK thanks I'll now answer the questions in my exam practise book.
Then I need to do some Chemistry revision
17. (Original post by _Xenon_)
oK thanks I'll now answer the questions in my exam practise book.
Then I need to do some Chemistry revision
Hey! I'd just like to say that you've done really well in learning this differentiation thing so far, good job!
18. (Original post by Zacken)
Hey! I'd just like to say that you've done really well in learning this differentiation thing so far, good job!
Thanks I think my teacher didn't teach these topics because they want the class to achieve Cs to at least pass maths and maybe some students would have struggled but I can do much better than that so I'm trying to learn these extra topics myself for maximum marks. Thanks very much for helping me with this otherwise I wouldn't have understood. I really appreciate it.

I have an exam practise book with exam style questions for every topic on my exam so I'm just trying to learn what I don't know atm. Thanks again!
19. (Original post by _Xenon_)
oK thanks I'll now answer the questions in my exam practise book.
Then I need to do some Chemistry revision
Have fun - I'm doing chem revision atm lol
20. (Original post by _Xenon_)
Thanks I think my teacher didn't teach these topics because they want the class to achieve Cs to at least pass maths and maybe some students would have struggled but I can do much better than that so I'm trying to learn these extra topics myself for maximum marks.
What grade are you aiming for?

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