Linear and Quadratic Approximations The linear and quadratic approximations or a function f at x = a are P 1 ( x ) = f ' ( a ) ( x − a ) + f ( a ) and P 2 ( x ) = 1 2 f ″ ( a ) ( x − a ) 2 + f ' ( a ) ( x − a ) + f ( a ) In Exercises 177-180, (a) find the specified linear and quadratic approximations of f , (b) use a graphing utility to graph f and the approximations, (c) determine whether P 1 or P 2 is the better approximation, and (d) state how the accuracy changes as you move farther from x = a . f ( x ) = ln x ; a = 1
Linear and Quadratic Approximations The linear and quadratic approximations or a function f at x = a are P 1 ( x ) = f ' ( a ) ( x − a ) + f ( a ) and P 2 ( x ) = 1 2 f ″ ( a ) ( x − a ) 2 + f ' ( a ) ( x − a ) + f ( a ) In Exercises 177-180, (a) find the specified linear and quadratic approximations of f , (b) use a graphing utility to graph f and the approximations, (c) determine whether P 1 or P 2 is the better approximation, and (d) state how the accuracy changes as you move farther from x = a . f ( x ) = ln x ; a = 1
Solution Summary: The author explains that the slope of the function f(x)=mathrmsinax at origin is a.
Linear and Quadratic Approximations The linear and quadratic approximations or a function f at
x
=
a
are
P
1
(
x
)
=
f
'
(
a
)
(
x
−
a
)
+
f
(
a
)
and
P
2
(
x
)
=
1
2
f
″
(
a
)
(
x
−
a
)
2
+
f
'
(
a
)
(
x
−
a
)
+
f
(
a
)
In Exercises 177-180, (a) find the specified linear and quadratic approximations of f, (b) use a graphing utility to graph f and the approximations, (c) determine whether
P
1
or
P
2
is the better approximation, and (d) state how the accuracy changes as you move farther from
x
=
a
.
2. Suppose the population of Wakanda t years after 2000 is given by the equation
f(t) = 45000(1.006). If this trend continues, in what year will the population reach 50,000
people? Show all your work, round your answer to two decimal places, and include units. (4
points)
3. Solve the equation, give the answer exactly (no calculator approximations), and show all your
work. (4 points)
log5 2x = 3
Let I =
f(x) dx, where f is the function whose graph is shown.
4
2
y
f
X
1
2
3
4
(a) Use the graph to find L2, R2 and M2.
R₂
M2
=
=
=
(b) Are these underestimates or overestimates of I?
O 42 is an underestimate.
O 42 is an overestimate.
◇ R2 is an underestimate.
OR2 is an overestimate.
OM2 is an underestimate.
○ M2 is an overestimate.
(c) Use the graph to find T2.
T₂ =
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