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# Differentiation help watch

1. Find the point or points on the curve with equation y=f(x) where the gradient is zero: f(x) x^-1+4x
I have done this up until -x^-2=4 and then I have no clue what to do from here any help would be appreciated
2. (Original post by Sukjeetsandhu)
Find the point or points on the curve with equation y=f(x) where the gradient is zero: f(x) x^-1+4x
I have done this up until -x^-2=4 and then I have no clue what to do from here any help would be appreciated

since f'(x) is the gradient function after all
3. Moved to maths.
4. (Original post by Sukjeetsandhu)
Find the point or points on the curve with equation y=f(x) where the gradient is zero: f(x) x^-1+4x
I have done this up until -x^-2=4 and then I have no clue what to do from here any help would be appreciated
It should be or , not what you wrote. Let me know if you can't see why.

At this point you can change back into fraction form :

Can you carry on from here?

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Updated: January 14, 2017
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