
Concept explainers
(a)
To explain: the identitymatrix
(a)

Answer to Problem 13RCC
The identity matrix
Explanation of Solution
The identity matrix
(b)
To find:the inverse matrix
(b)

Answer to Problem 13RCC
If A is a
Explanation of Solution
If A is a
Where
(c)
To write: the formula for the inverse of a
(c)

Answer to Problem 13RCC
The formula for the inverse matrixof a
Explanation of Solution
Let A be a
The inverse of A is the matrix
Observe that this formula is valid only if
Otherwise, A does not have an inverse matrix.
Conclusion:
Therefore,the formula for the inverse matrixof a
(d)
To explain: the inverse of a
(d)

Answer to Problem 13RCC
The inverse of a
Explanation of Solution
Calculation:
Given a
The entries to the right of the dashed line represent the matrix A, while the entries to the left of the dashed line represent the matrix
To obtain the inverse, elementary row operations to transform the A matrix into reduced row-echelon form
That is
Use such operations to make the matrix on the left become the identity matrix while the matrix on the right will become the inverse
Chapter 10 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
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