Math R105 Spring 2022
Hello, dear friend, you can consult us at any time if you have any questions, add WeChat: daixieit
Math R105
Spring 2022
Exam 2 Review Problems
1. Use the Wronskian to show that the functions are linearly independent.
a)
1 =
2,
2 =
−3
b)
1 =
2
,
2 =
−3![]()
c)
1 = 1,
2 = cos 3
,
3 = sin 3
2. First verify that
1,
2, …. ![]()
are solutions of the differential equation. Then find a particular solution that satisfies the given initial conditions.
a)
2
′′ + 2![]()
′ − 6
= 0;
1 =
2,
2 =
−3;
(2) = 10,
′(2) = 15
b)
′′ +
′ − 6
= 0;
1 =
2
,
2 =
−3
;
(0) = 7,
′(0) = −1
c)
(3) + 9
′ = 0;
1 = 1,
2 = cos 3
,
3 = sin 3
;
(0) = 3;
′(0) = −1,
′′(0) = 2
3. Find the general solution of the differential equation given.
a) 6
′′ − 7
′ − 20
= 0
b)
(4) − 8
′′ + 16
= 0
c)
(4) = 16![]()
d)
(3) + 3
′′ − 54
= 0; Given:
=
3
is a solution.
4. Solve the initial value problems.
a)
′′ + 4
= 2
;
(0) = 1,
′(0) = 2
b)
′′ + 9
= sin 2
;
(0) = 1,
′(0) = 0
2022-03-16