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Can anyone help with C1 differentiation?

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1. Hi, I'm currently having a problem with this one question, I have done parts A and B, but using the same method with C I seem to keep getting the wrong answer, can anyone help?

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2. (Original post by Eden00)
Hi, I'm currently having a problem with this one question, I have done parts A and B, but using the same method with C I seem to keep getting the wrong answer, can anyone help?

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3. (Original post by Eden00)
Hi, I'm currently having a problem with this one question, I have done parts A and B, but using the same method with C I seem to keep getting the wrong answer, can anyone help?

Posted from TSR Mobile
What's wrong with it? The power decreases by 1 and if that's what you're struggling with?
4. If its the fractional power that is making it hard for you, lets stick a 1 in front of the x. Now you can differentiate it how you did the other ones; 1 * 3/2 then subtract 1 from the power.
5. It's not the differentiation part it's the finding the points.

The answer is (16,-31) and I'm unsure how to get there

EDIT: I know in the photo it's -5, but I meant it to be 5, I rewrote my workings to post quickly and made the mistake

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Attached Images

6. (Original post by Eden00)
It's not the differentiation part it's the finding the points.

The answer is (16,-31) and I'm unsure how to get there

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When you differentiate a constant it disappears remember
7. (Original post by solC)
When you differentiate a constant it disappears remember
I'm an idiot... I'll have a go now and see what I get

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8. (Original post by solC)
When you differentiate a constant it disappears remember
I got rid of the constant the first time I attempted it, the second time I didn't but I'm still running into the same problem.

I get to this, but this isn't the right answer? What step am I missing

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9. (Original post by Eden00)
I got rid of the constant the first time I attempted it, the second time I didn't but I'm still running into the same problem.

I get to this, but this isn't the right answer? What step am I missing

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I think you are getting confused with what x^1/2 means. If you have 4=x^1/2 you need to square both sides instead of taking the square root,
10. (Original post by OGFakiie)
lol this is amateur stuff
Sorry big man
11. (Original post by solC)
I think you are getting confused with what x^1/2 means. If you have 4=x^1/2 you need to square both sides instead of taking the square root,
Ahh thank you! I feel like such an idiot!! I was confusing myself so much, such a stupid mistake. Thank you for the help!

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12. (Original post by solC)
Sorry big man
sfe
13. (Original post by Eden00)
Ahh thank you! I feel like such an idiot!! I was confusing myself so much, such a stupid mistake. Thank you for the help!

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No worries
14. (Original post by OGFakiie)
sfe
What does Student Finance England got to do with this?
15. (Original post by OGFakiie)
lol this is amateur stuff
Im glad I'm an amateur then

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16. (Original post by RDKGames)
What does Student Finance England got to do with this?
good one i'll give you that

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