Q12 of 110 Page 260

Using properties of determinants prove that:



[R1’ = R1 - R2 & R2’ = R2 - R3]



[R1’ = R1/(a - 1) & R2’ = R2/(a - 1)]


= (a - 1)2[a + 1 - 0 - 2] [expansion by first row]


= (a - 1)3


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