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Questions  

Let A=4    32    5 and x,yR are such that A2+xA+yI=0 then (x,y) equals

a
(–9, –14)
b
(9, –14)
c
(–9, 14)
d
(9, 14)

detailed solution

Correct option is C

We have A2=22    2718    31∴ A2+xA+yI=O⇒ 22+4x+y=0, 27+3x=018+2x=0, 31+5x+y=0⇒ x=−9,y=14

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