# Pls help me with this question:

if a and b are two square matrices of the same order then (a+b)(a-b) is equal to..............

And A - B = matrix of same order as of A and B

So (A+B)(A-B) = matrix of same order as A and B

$LetA=\left[\begin{array}{cc}2& 4\\ 6& 8\end{array}\right],B=\left[\begin{array}{cc}5& 7\\ 9& 2\end{array}\right]\phantom{\rule{0ex}{0ex}}SoA+B=\left[\begin{array}{cc}7& 11\\ 15& 10\end{array}\right]\phantom{\rule{0ex}{0ex}}AndA-B=\left[\begin{array}{cc}-3& -3\\ -3& 6\end{array}\right]\phantom{\rule{0ex}{0ex}}So(A+B)(A-B)=\left[\begin{array}{cc}-54& 45\\ -75& 15\end{array}\right]$

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