Find the average rate of change of
f
(
x
)
=
9
x
2
−
5
\displaystyle {f{{\left({x}\right)}}}={9}{x}^{{2}}-{5}
f
(
x
)
=
9
x
2
−
5
on the interval
[
1
,
b
]
\displaystyle {\left[{1},{b}\right]}
[
1
,
b
]
. Your answer will be an expression involving
b
\displaystyle {b}
b
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Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Be sure your variables match those in the question