Differential equations an introduction to modern methods and applications 3rd edition brannan soluti

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Differential Equations An Introduction to Modern Methods and Applications 3rd Edition Full download link at: https://testbankpack.com/p/solution-manualfor-differential-equations-an-introduction-to-modern-methods-andapplications-3rd-edition-by-brannan-isbn-11185317799781118531778/

Chapter 6 Systems of First Order Linear Equations 6.1

Definitions and Examples

1.(a) We compute: et 2e−t A + 3B =

e2t

5et e−t −e2t −et 3e−t 5e2t

6et +

3e−t

12e2t

7et

−3et 9e−t 3e2t t −t 12e −3e −3e2t

=

5e−t 13e2t

2et 10e−t 11et 0

(b) We compute: AB =

−2 + 2e2t + 4e3t 1 + 6e−2t − et 2et + 4e3t − e4t −1 + 10e2t − 4e3t 5 + 3e−2t + et et + 20e3t + e4t 2t 3t −3 − 2e + 20e −1 + 9e−2t − 5et 3et − 4e3t − 5e4t

(c) We differentiate elementwise: dA = dt

et −2e−t 2e2t 5et −e−t −2e2t −et −3e−t 10e2t

.

(d) We integrate elementwise: e − 1 2 − 2/e

Z1 A(t) dt = 0

e2 /2 − 1/2

5e − 5 1 − 1/e 1/2 − e2 /2 1 − e 3 − 3/e 5e2 /2 − 5/2

.

.

2e2t 2e2t

.


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