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# Differentiation help watch

1. its been a while since i have done these, and well my notes are not helping at all, and i'm just confusing my self even more

Differentiate the following with respect to x

y=x2

that come out as dy/dx=2X1

if i was to do y=5X-4
would that be dy/dx=-20X-5

thank you
2. No, not quite. What's -4 - 1?
3. (Original post by generalebriety)
No, not quite. What's -4 - 1?
-5

i take it i'm doing it right apart from that part
4. wouldn't it become dy/dx=-20X-5?
as you lose one from the power so -4 - 1 = -5?
i might be completly wrong as i haven't done differentiation since my C2 exam at the begining of june
5. (Original post by greggy.gregory)
wouldn't it become dy/dx=-20X-5?
as you lose one from the power so -4 - 1 = -5?
i might be completly wrong as i haven't done differentiation since my C2 exam at the begining of june
yeah just me being crazy and not thinking

just wanted to make sure i was doing it right

cheers guys
6. (Original post by robinson999)
-5

i take it i'm doing it right apart from that part
Yep.
7. (Original post by robinson999)
yeah just me being crazy and not thinking
I think i made that same mistake in my exams, i certainly kept making it when i was doing me revision
8. (Original post by greggy.gregory)
I think i made that same mistake in my exams, i certainly kept making it when i was doing me revision
ouch , it maybe because it just looking at it with out thinking going, that's that with out checking after

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