For the function
f
(
x
)
=
3
x
2
−
x
\displaystyle {f{{\left({x}\right)}}}={3}{x}^{{2}}-{x}
f
(
x
)
=
3
x
2
−
x
, 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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