Q174
A is m × n full rank matrix with m > n and I is an identity matrix. Let matrix A' = (ATA)-1AT, Then, which one of the following statement is TRUE?
A is m × n full rank matrix with m > n and is an identity matrix. Let matrix A' = (ATA)-1AT, Then, which one of the following statement is TRUE?
A.
AA' A = A
AnswerB.
(AA')2 = A
C.
AA'A =
D.
AA'A = A'
Answer: Option A
Solution
Answer: Option A
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