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Question
If A=⎡⎢⎣123⎤⎥⎦, then AA=
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Solution
Given A=⎡⎢⎣123⎤⎥⎦
A.A=⎡⎢⎣123⎤⎥⎦⎡⎢⎣123⎤⎥⎦=⎡⎢⎣1+2+32+4+63+6+9⎤⎥⎦=⎡⎢⎣61218⎤⎥⎦
Given A=⎡⎢⎣123⎤⎥⎦
A.A=⎡⎢⎣123⎤⎥⎦⎡⎢⎣123⎤⎥⎦=⎡⎢⎣1+2+32+4+63+6+9⎤⎥⎦=⎡⎢⎣61218⎤⎥⎦
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