Curve sketching: 2nd derivatives test

akotoh · #1 Oct 1, 2009, 08:06 AM

Gud day!

I just wanna know what is the correct answer in this problem:

Equation:
y = 1/3 x^3 - 1/2 x^2 - 2x
the point of inflection that i got is (1/2 , -3/4) but according to the book its (1/2, -13/12). How do they get that?

thanks!

ArcSine · Oct 1, 2009, 08:14 AM

Just evaluate the original equation for x = 1/2.

radiation · Oct 4, 2009, 03:17 AM

I think thr is some error in ur ans.. for x=1/2, the only value for y is -13/12..



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