3 and 4 .Determinants and Matrices
medium

यदि $A$ और $B$ दो आव्यूह इस प्रकार हैं कि $AB = B$ और $BA = A,$ तो ${A^2} + {B^2} = $

A

$2AB$

B

$2BA$

C

$A + B$

D

$AB$

Solution

दिया गया है, $AB = B$तथा $BA = A$   

इसलिये ${A^2} + {B^2} = AA + BB = A(BA) + B(AB)$   

$ = (AB)A + (BA)B = BA + AB = A + B$,

$(\because \,\,AB = B$ और  $BA = A)$.

Standard 12
Mathematics

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