CPM Homework Help : APCALC Problem 5-25

Use the graphs of $y=f^{\prime} ( x )$ and $y=g^{\prime} ( x )$ below to determine the $x$ -values of all local minima, maxima, and points of inflection.

$f^{\prime} ( x )$

Hint (a):

$f ( x )$ will be increasing where $f^{\prime} ( x )$ is positive, and vice versa.
$f ( x )$ will be concave up where $f^{\prime} ( x )$ has positive slopes, and vice versa.

Answer (a):

Local max at $x = −1$ ; $f^{\prime} ( x )$ changes from positive to negative.
Inflection points at $x = −0.5, 0, 0.5$ ; $f^{\prime} ( x )$ changes slope.
Local min at $x = 1; f^\prime\left(x\right)$ changes from negative to positive.

$g^{\prime} (x)$

Hint (b):

See the hint in part (a).