AP CALC. AB

posted by Darcy

2. A cubic function is a polynomial of degree 3 and has the form y=mx^3+bx^2+cx+d; m≠0. What is the maximum quantity of local extreme values a given cubic function can have?
a. 2
b. 1
c. 0
d. 3

Is it (a)??

2. Let f(x)=xln(x). The minimum value attained by f is
a) there is no minimum
b)1/e
c)-1/e
d)-1
e)0

is it (a) ??

  1. Steve

    #2 (a) is correct

    #3 f' = lnx + 1
    The only extremum is at x = 1/e
    f" = 1/x, which is positive at 1/e, so f(1/e) is a minimum.

    Looks like (c) is the answer

    See the graph at

    http://www.wolframalpha.com/input/?i=x*lnx

    Ignore tha part where x<0, since lnx is not real there.

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