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# C1 - Quick differentiation question. Watch

1. Hi,

What's the method for finding the derived function of this question, given that f(x) = x^1/4?
2. x^1/4

1) Differentiate meaning multiply the coeficcient by the power- in this case 1 x 1/4, and then subtracting the new power by 1.

so it would be :

1/4 x to the power of - 3/4
3. multiply by the power and subtract 1 from the power
4. (Original post by Mr Inquisitive)
Hi,

What's the method for finding the derived function of this question, given that f(x) = x^1/4?
The rule is still the same.

If , where a and b are constants

Then

Fractional powers don't change anything.
5. (Original post by bijesh12)
x^1/4

1) Differentiate meaning multiply the coeficcient by the power- in this case 1 x 1/4, and then subtracting the new power by 1.

so it would be :

1/4 x to the power of - 3/4
Originally I thought this, but the Edexcel C1 book I have says that it's 1/4x^-4/3...
6. (Original post by Mr Inquisitive)
Originally I thought this, but the Edexcel C1 book I have says that it's 1/4x^-4/3...
Seems like a typo. It should be They've got the 3 and 4 the wrong way round.
7. (Original post by dknt)
Seems like a typo. It should be They've got the 3 and 4 the wrong way round.
Ah, no wonder that had me a little confused. Thank you for clearing that up for me.
8. No worries
9. The amount of typos in the Edexcel book is ridiculous, you'd think they would check for them. I was racking my brains for hours yesterday over a question, only to find out it was indeed a typo.
10. (Original post by Mr Inquisitive)
Originally I thought this, but the Edexcel C1 book I have says that it's 1/4x^-4/3...
I've noticed a few mistakes in the edexcel textbooks. Take our word for it. If , then or is . Sometimes it might be hard to tell if you're wrong or the textbook's wrong.

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