1.

If A=[{:(1,2,1),(2,1,3),(1,1,0):}] then prove that A^3-2A^2-7A-4I_3=0. Hence find A^(-1)

Answer»


ANSWER :`A^(-1)=1/4[{:(-3,1,5),(3,1,-1),(1,1,5):}]`


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