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    I learned how to find stationary points with quadratic derivatives and stuff, but I came across this question and I'm really struggling to find the solution for this question.
    Find the minimum point on the graph with equation y=√x+4/x, how do I find the stationarys?


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    (Original post by cjayballs)
    I learned how to find stationary points with quadratic derivatives and stuff, but I came across this question and I'm really struggling to find the solution for this question.
    Find the minimum point on the graph with equation y=√x+4/x, how do I find the stationarys?
    Same as how you usually do, just slightly trickier when dealing with hint negative indices hint.

    It may help to divide each term by x to get rid of the denominator, assuming you have (a+b)/c there - what you have written is ambiguous!
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    Isn't that equation same as x^1/2 +4x^-1 differentiate it and make it equal zero
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    I can't tell if you mean [sqrt(x) + 4]/x or sqrt(x) + (4/x).
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    Factorise:



    Let










    Edit: probably wasn't wise giving the OP the full solution since it isn't beneficial... oops
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    But how do I rearrange the derivative in order to give me the stationary points when I have the derivative equal to 0?
 
 
 
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