Westonci.ca is the best place to get answers to your questions, provided by a community of experienced and knowledgeable experts. Our platform provides a seamless experience for finding reliable answers from a network of experienced professionals. Our platform offers a seamless experience for finding reliable answers from a network of knowledgeable professionals.

Which value of [tex][tex]$t$[/tex][/tex] makes the two matrices inverses of each other?

[tex]\[
\begin{pmatrix}
-4 & 6 \\
3 & -4
\end{pmatrix}
\begin{pmatrix}
2 & 3 \\
1.5 & t
\end{pmatrix}
\][/tex]

A. -3
B. -2
C. 2
D. 3


Sagot :

To determine which value of [tex]\( t \)[/tex] makes the two matrices inverses of each other, we need to verify if the product of the two matrices results in the identity matrix. We will consider the given matrices:

[tex]\[ A = \begin{pmatrix} -4 & 6 \\ 3 & -4 \end{pmatrix} \][/tex]
and
[tex]\[ B = \begin{pmatrix} 2 & 3 \\ 1.5 & 4 \end{pmatrix} \][/tex]

The problem specifies testing specific values for [tex]\( t \)[/tex]. However, let's first check the product of [tex]\( A \)[/tex] and [tex]\( B \)[/tex]:

Perform matrix multiplication:
[tex]\[ A \cdot B = \begin{pmatrix} -4 & 6 \\ 3 & -4 \end{pmatrix} \cdot \begin{pmatrix} 2 & 3 \\ 1.5 & 4 \end{pmatrix} \][/tex]

Calculate element-wise:
1. First row, first column:
[tex]\[ (-4 \cdot 2) + (6 \cdot 1.5) = -8 + 9 = 1 \][/tex]
2. First row, second column:
[tex]\[ (-4 \cdot 3) + (6 \cdot 4) = -12 + 24 = 12 \][/tex]
3. Second row, first column:
[tex]\[ (3 \cdot 2) + (-4 \cdot 1.5) = 6 - 6 = 0 \][/tex]
4. Second row, second column:
[tex]\[ (3 \cdot 3) + (-4 \cdot 4) = 9 - 16 = -7 \][/tex]

This forms the resultant matrix:
[tex]\[ A \cdot B = \begin{pmatrix} 1 & 12 \\ 0 & -7 \end{pmatrix} \][/tex]

For [tex]\( A \)[/tex] and [tex]\( B \)[/tex] to be inverses of each other, this product should be the identity matrix:
[tex]\[ I = \begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix} \][/tex]

Upon examining the resultant matrix, it is evident that:
[tex]\[ \begin{pmatrix} 1 & 12 \\ 0 & -7 \end{pmatrix} \][/tex]
is not the identity matrix.

Thus, matrices [tex]\( A \)[/tex] and [tex]\( B \)[/tex] are not inverses of each other under any normal circumstances. Hence, none of the provided options ([tex]\(-3, -2, 2, 3\)[/tex]) can make these matrices inverses of each other.

So, the final answer is:
[tex]\[ None \text{ of the values make the matrices inverses of each other.} \][/tex]
We appreciate your visit. Our platform is always here to offer accurate and reliable answers. Return anytime. Thank you for your visit. We're committed to providing you with the best information available. Return anytime for more. Discover more at Westonci.ca. Return for the latest expert answers and updates on various topics.