Answer :

i. A-2B = diag -2diag

= diag-diag


= diag


= diag


Hence, A-2B=diag


ii. B+C-2A


=diag +diag-2diag


=diag+diag-diag


=diag


=diag


Hence, B+C-2A=diag


iii. 2A+3B-5C


=2diag+3diag-5diag


=diag+diag-diag


=diag


=diag


Hence, 2A+3B-5C=diag


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