Differential Equations with Boundary-Value Problems
Differential Equations with Boundary-Value Problems
9th Edition
ISBN: 9781337632515
Author: Dennis G. Zill
Publisher: Cengage Learning US
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Chapter B, Problem 1E

(a)

To determine

To find: The matrix of A+B.

(a)

Expert Solution
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Answer to Problem 1E

The result after performing the indicated operation of addition is [21121]_.

Explanation of Solution

Given that the matrix A is [4569] and B is [26810].

It is known that two or more matrices can be added when they have same order.

Compute the matrix A+B as follows.

A+B=[4569]+[26810]=[4+(2)5+6(6)+89+(10)]=[21121]

Thus, the result after performing the indicated operation of addition is [21121]_.

(b)

To determine

To find: The matrix of BA.

(b)

Expert Solution
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Answer to Problem 1E

The result after performing the indicated operation of addition is [611419].

Explanation of Solution

Given that the matrix A is [4569] and B is [26810].

It is known that two or more matrices can be subtracted when they have same order.

Compute the matrix BA as follows.

BA=[26810][4569]=[(2)4658(6)(10)9]=[611419]

Thus the result after performing the indicated operation is [611419].

(c)

To determine

To find: The matrix of 2A+3B.

(c)

Expert Solution
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Answer to Problem 1E

The matrix of 2A+3B is [2281212].

Explanation of Solution

Given that the matrix A is [4569] and B is [26810].

Multiply each term of the matrix A by a scalar value 2 to get the matrix 2A.

2[4569]=[24252(6)29]=[8101218]

Similarly, multiply each term of the matrix B by a scalar value 3 to get the matrix 3B.

3[26810]=[3(2)36383(10)]=[6182430]

It is known that two or more matrices can be added when they have same order.

Now, add 2A and 3B to get the result of matrix 2A+3B as follows.

2A+3B=[8101218]+[6182430]=[8+(6)10+18(12)+2418+(30)]=[2281212]

Thus, the matrix of 2A+3B is [2281212].

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