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# C3 chain rule help!! Watch

1. Hiya,

I tried to differentiate this using the chain rule but my answer isn't right?? I don't understand what I did wrong?

Thanks

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2. (Original post by strawberrysnow)
Hiya,

I tried to differentiate this using the chain rule but my answer isn't right?? I don't understand what I did wrong?

Thanks

Posted from TSR Mobile
Set u = x-1
3. (Original post by strawberrysnow)
Hiya,

I tried to differentiate this using the chain rule but my answer isn't right?? I don't understand what I did wrong?

Thanks

Posted from TSR Mobile
You haven't used the chain rule there at all, the chain rule is for nested functions as it were so say.
FOr let then:

You want to use the chain rule so let:

Then
4. (Original post by morgan8002)
Set u = x-1
(Original post by joostan)
You haven't used the chain rule there at all, the chain rule is for nested functions as it were so say.
FOr let then:

You want to use the chain rule so let:

Then
Thank you both so much!! I've got the right answer now
5. I get [-4e^(1/x)] / x^2

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