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If A and B are two matrices such thatAB=A and BA=B then B2=? Cant we write it as equal to bothA 2and B2 ?If not why?

rutu , 7 Years ago
Grade 12
anser 2 Answers
ravi

Last Activity: 7 Years ago

 Dear rutu, Given that AB=A AND BA=B.
NOW B^2=BB
=(BA)B
=B(AB)  (MATRIX MULTIPLICATION OBEYS ASSOCIATIVE LAW)
=BA
=B.
 

ankit singh

Last Activity: 4 Years ago

as BA=B,THAN A =I,AS AB=B THAN B=I
THERFORE B^2=B  OR
NOW B^2=BB
=(BA)B
=B(AB)  (MATRIX MULTIPLICATION OBEYS ASSOCIATIVE LAW)
=BA
=B
.REGARDS ANKIT SINGH

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