Math R105 Spring 2022
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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