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Let’s check out your problem:
Let
f
(
x
)
=
x
2
e
x
f(x)=x^{2} e^{x}
f
(
x
)
=
x
2
e
x
.
\newline
f
′
(
x
)
=
f^{\prime}(x)=
f
′
(
x
)
=
View step-by-step help
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Math Problems
Algebra 2
Write a formula for an arithmetic sequence
Full solution
Q.
Let
f
(
x
)
=
x
2
e
x
f(x)=x^{2} e^{x}
f
(
x
)
=
x
2
e
x
.
\newline
f
′
(
x
)
=
f^{\prime}(x)=
f
′
(
x
)
=
Identify rule:
Identify the rule to use for differentiation; here, we need the product rule since
f
(
x
)
f(x)
f
(
x
)
is the product of two functions,
x
2
x^2
x
2
and
e
x
e^x
e
x
.
Apply product rule:
Apply the product rule:
(
u
∗
v
)
′
=
u
′
v
+
u
v
′
(u*v)' = u'v + uv'
(
u
∗
v
)
′
=
u
′
v
+
u
v
′
, where
u
=
x
2
u = x^2
u
=
x
2
and
v
=
e
x
v = e^x
v
=
e
x
.
Differentiate
u
u
u
:
Differentiate
u
=
x
2
u = x^2
u
=
x
2
to get
u
′
=
2
x
u' = 2x
u
′
=
2
x
.
Differentiate
v
v
v
:
Differentiate
v
=
e
x
v = e^x
v
=
e
x
to get
v
′
=
e
x
v' = e^x
v
′
=
e
x
.
Plug into formula:
Plug
u
′
u'
u
′
,
u
u
u
,
v
′
v'
v
′
, and
v
v
v
into the product rule formula:
f
′
(
x
)
=
2
x
⋅
e
x
+
x
2
⋅
e
x
f'(x) = 2x \cdot e^x + x^2 \cdot e^x
f
′
(
x
)
=
2
x
⋅
e
x
+
x
2
⋅
e
x
.
Simplify expression:
Combine like terms to simplify the expression:
f
′
(
x
)
=
(
2
x
+
x
2
)
⋅
e
x
f'(x) = (2x + x^2) \cdot e^x
f
′
(
x
)
=
(
2
x
+
x
2
)
⋅
e
x
.
Correct mistake:
Realize there's a mistake in the previous step; we don't actually combine terms like that. Correct the expression:
f
′
(
x
)
=
2
x
⋅
e
x
+
x
2
⋅
e
x
f'(x) = 2x \cdot e^x + x^2 \cdot e^x
f
′
(
x
)
=
2
x
⋅
e
x
+
x
2
⋅
e
x
.
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∑
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=
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(
7
n
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)
\sum_{n=1}^{10} (7n+4)
∑
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What kind of sequence is this?
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…
2, 10, 50, 250, \ldots
2
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,
50
,
250
,
…
Choices:Choices:
\newline
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\text{[A]arithmetic}
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,
_
_
_
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4
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Classify the series.
∑
n
=
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(
n
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∑
n
=
0
12
(
n
+
2
)
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Choices:
\newline
[A]arithmetic
\text{[A]arithmetic}
[A]arithmetic
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[B]geometric
\text{[B]geometric}
[B]geometric
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[C]both
\text{[C]both}
[C]both
\newline
[D]neither
\text{[D]neither}
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Question
Find the first three partial sums of the series.
\newline
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26
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⋯
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11
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16
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21
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26
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\newline
Write your answers as integers or fractions in simplest form.
\newline
S
1
=
S_1 =
S
1
=
____
\newline
S
2
=
S_2 =
S
2
=
____
\newline
S
3
=
S_3 =
S
3
=
____
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Question
Find the third partial sum of the series.
\newline
3
+
9
+
15
+
21
+
27
+
33
+
⋯
3 + 9 + 15 + 21 + 27 + 33 + \cdots
3
+
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15
+
21
+
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+
33
+
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\newline
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3
=
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=
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Question
Find the first three partial sums of the series.
\newline
1
+
7
+
13
+
19
+
25
+
31
+
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1
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\newline
Write your answers as integers or fractions in simplest form.
\newline
S
1
=
S_1 =
S
1
=
____
\newline
S
2
=
S_2 =
S
2
=
____
\newline
S
3
=
S_3 =
S
3
=
____
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Question
Does the infinite geometric series converge or diverge?
\newline
1
+
3
4
+
9
16
+
27
64
+
⋯
1 + \frac{3}{4} + \frac{9}{16} + \frac{27}{64} + \cdots
1
+
4
3
+
16
9
+
64
27
+
⋯
\newline
Choices:
\newline
[A]converge
\text{[A]converge}
[A]converge
\newline
[B]diverge
\text{[B]diverge}
[B]diverge
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