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**Quacky** The matrices A, B and C represent 3 transformations. By combining the three transformations, in the order A, then B, then C, a simple, single transformation is obtained which is represented by the matrix R.

Find R.

$\displaystyle A = \begin{pmatrix} -2&1\\7&-3 \end{pmatrix}$

$\displaystyle B = \begin{pmatrix} 4&1\\-5&-1 \end{pmatrix}$

$\displaystyle C =\begin{pmatrix} 3&1\\2&1 \end{pmatrix}$

I have tried working out the matrix ABC but that gives an incorrect solution. I don't really know how to approach this. The answer is the identity matrix, it says in the textbook. Thanks in advance for any help.