(a)
To explain: Whether the statement is sometimes , always , or never true for the matrices A and B .
(a)
Answer to Problem 34HP
The statement is always true.
Explanation of Solution
Given information:
If
Then
According to the statement,
If
That means
The dimensions of the two matrices are the same.
Thus,
As long as the dimensions of the matrices are the same,
If
Then
(b)
To explain: Whether the statement isalways , sometimes , or never true for the matrices A and B .
(b)
Answer to Problem 34HP
The statement is always true.
Explanation of Solution
Given information:
If k is a real number,
Then
kA and kB exist.
In this case,
k acts as a scalar.
According to the statement,
If k is a real number,
We can apply it to any of the matrices,
Either A or B .
Therefore,
The statement is always true.
(c)
To explain: Whether the statement is never , sometimes , or always true for the matrices A and B .
(c)
Answer to Problem 34HP
The statement is always true.
Explanation of Solution
Given information:
If
Then
According to the statement,
If
That only means
The dimensions of the two matrices are not the same.
Thus,
As long as the dimensions of the matrices are not the same,
If
Then
(d)
To explain: Whether the statement is always , never , or sometimes true for the matrices A and B .
(d)
Answer to Problem 34HP
The statement is sometimes true.
Explanation of Solution
Given information:
If A and B have the same number of elements,
Then
A and B may have the same number of elements,
Such that
That does not necessarily mean that both A and B have the same dimensions.
For example:
A could be
Whereas,
B could be
Both matrices have 6 elements,
But the dimensions are different.
Hence,
We could not add them together.
Therefore,
The statement is sometimes true.
Since it is possible that both matrices A and B could have the same dimensions and could be added together.
Thus,
We can say that
The statement is sometimes true.
(e)
To explain: Whether the statement isnever , always , or sometimestrue for the matrices A and B .
(e)
Answer to Problem 34HP
The statement is sometimes true.
Explanation of Solution
Given information:
If kA exists and kB exists,
Then
We know that
kA exists and kB exists,
That means
Both matrices A and B have the scalar k .
However,
We don’t know the dimensions of either matrix.
Thus,
We cannot say for sure that
Therefore,
The statement is sometimes true.
Sometimes refers to that the matrices could have the same dimensions, which would allow them to be added together.
Chapter 3 Solutions
Glencoe Algebra 2 Student Edition C2014
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