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Engineering Mathematics
Non-Homogeneous Linear Differential Equations (Methods for finding PI for e^(ax))
For d2y/dx2+4...
Question
For
d
2
y
d
x
2
+
4
d
y
d
x
+
3
y
=
3
e
2
x
,
the particular integrals is
A
1
15
e
2
x
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B
1
5
e
2
x
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C
3
e
2
x
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D
C
1
e
−
x
+
C
2
e
3
−
x
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Solution
The correct option is
B
1
5
e
2
x
Given the differential equation
d
2
y
d
x
2
+
4
d
y
d
x
+
3
y
=
3
e
2
x
P.I. =
3
1
(
D
2
+
4
D
+
3
)
e
2
x
=
3
1
2
2
+
4.2
+
3
e
2
x
=
3
15
e
2
x
P.I.
=
1
5
e
2
x
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7
Similar questions
Q.
If
y
=
3
e
2
x
+
2
e
3
x
.
prove that
d
2
y
d
x
2
−
5
d
y
d
x
+
6
y
=
0
.
Q.
The particular integral of
d
2
y
d
x
2
+
d
y
d
x
=
x
2
+
2
x
+
4
is
Q.
The particular integral of the differential equation
d
2
y
d
x
2
−
2
d
y
d
x
=
e
2
x
s
i
n
x
Q.
Identify the degree of differential equation:
(i)
d
x
d
y
+
3
x
y
=
x
4
(ii)
d
2
y
d
x
2
+
4
d
y
d
x
−
b
y
=
s
i
n
x
Q.
The solution of the differential equation
d
2
y
d
x
2
−
d
y
d
x
−
2
y
=
3
e
2
x
, where,
y
(
0
)
=
0
and
y
(
0
)
=
−
2
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