Posted by Paris on Saturday, March 13, 2010 at 9:46pm.
Could you post your answers if you need a confirmation?
Also, calculate f'(x) and substitute the x-coordinate of the maximum/minimum to see if f'(x)=0. This will be another way to confirm your answer.
my answer is :
maxima: x= -1.56
minima:x=-1.29, x=-1.25
f'(x)=3*x^2+4*x+4/x^3
f'(-1.56)=0.0072
f'(-1.559)=-0.00021
Therefore x=-1.56(approx.) is a maximum or minimum.
f"(x)=6*x-12/x^4+4
f"(-1.56)=-7.386 >0
Therefore x=-1.56 is a maximum.
f'(-1.29)=-2.03 ≠ 0
f'(-1.25)=-2.3605 ≠ 0
Therefore x=-1.29 and x=-1.25 are not maxima nor minima.
Check your graph without forgetting that the function is undefined at x=0.
oh thank you so much, so x=-1.56 is a maxima, and we dont have a minima?
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