CPM Homework Help : APCALC Problem 3-60

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3-60.

Write an equation for $f^\prime (x)$ for each function below.

$f(x) = \frac { 9 } { x }$
Hint (a):
$f(x)=\frac{9}{x}=9x^{-1}$
$f'(x)=\underline{ \ \ \ \ \ \ \ \ \ \ }$

$f(x) = −3x^7 − 6x$
Hint (b):
Use the Power Rule.
Answer (b):
$f^\prime (x) = −21x^6 − 6$

$f(x) = 5x^{–4}$
Hint (c):
Refer to hint in part (b).

$f(x) = m$
Hint (d):
$m$ is a constant. What is the slope of the a
horizontal line $y = m$ ?

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