Question: 2.54. (Sec. 2.5) Use Problem 2.53 to show that x'I -IX = (X(I) - I12Ii2IX(2)'I'/2( x(1) - I12Ii2IX(2) + x(2)'Iib(2).

2.54. (Sec. 2.5) Use Problem 2.53 to show that x'I -IX = (X(I) - I12Ii2IX(2»)'I'/2( x(1) - I12Ii2IX(2») + x(2)'Iib(2).

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