Find the points on the graph of y= (1/3)x^3-5x- (4/x) at which the slope of the tangent is horizontal.(adsbygoogle = window.adsbygoogle || []).push({});

what i know:

- we have to use m=[f(a+h)-f(a)]/h

- if we change the equation we can get 3x^4 - 15x^2 -12

- the slope of the tangent is zero.

THANX

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# Question on the slope of the tangent

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