given
Determine whether the
or divergent.
integral e power x
dx is convergentor divergent
Answers
Answered by
1
Answer:
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Answered by
1
Answer:
Explanation:
First focusing on the integral without bounds:
∫
e
1
x
x
3
d
x
Let
t
=
1
x
this implies that
d
t
=
−
1
x
2
d
x
, so the integral can be rewritten as:
=
−
∫
e
1
x
(
1
x
)
(
−
1
x
2
)
d
x
=
−
∫
t
e
t
d
t
Performing integration by parts, letting:
{
u
=
t
==⇒
d
u
=
d
t
d
v
=
e
t
d
t
==⇒
v
=
e
t
=
−
(
t
e
t
−
∫
e
t
d
t
)
=
−
e
t
(
t
+
1
)
=
e
1
x
(
1
−
1
x
)
So:
∫
1
0
e
1
x
x
3
d
x
=
e
1
x
(
1
−
1
x
)
∣
∣
∣
∣
1
0
=
e
(
1
−
1
)
−
lim
x
→
0
+
e
1
x
(
1
−
1
x
)
As
x
→
0
,
1
x
→
∞
and
e
1
x
→
∞
. Together, the limit will also be
∞
, so the integral diverge
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