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
.
A 20 foot ladder rests on level ground; its head (top) is against a vertical wall. The bottom of the ladder begins by being 12 feet from the wall but begins moving away at the rate of 0.1 feet per second. At what rate is the top of the ladder slipping down the wall? You may use a calculator.
Explain the focus and reasons for establishment of 12.4.1(root test) and 12.4.2(ratio test)
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