For the function
f
(
x
)
=
6
x
+
9
\displaystyle {f{{\left({x}\right)}}}={6}{x}+{9}
f
(
x
)
=
6
x
+
9
, evaluate and simplify.
f
(
x
+
h
)
−
f
(
x
)
h
\displaystyle \frac{{{f{{\left({x}+{h}\right)}}}-{f{{\left({x}\right)}}}}}{{h}}
h
f
(
x
+
h
)
−
f
(
x
)
=
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