give an example of two matrices a and b for which ab=0 but ba is not equal to 0 where 0 is null matrix and a and b are both non zero matrices

let A and B be two matrices of order 2*2 such that A and B both are not null matrix.

let A=-1100 and B=1111

then AB=-1+1-1+100=0000 i.e. AB is a null matrix

and BA=1111-1100=-11-11 which is not a null matrix.

hope this helps you

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merit nation plz answer...its urgent

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