7. Let A be a 32-by-48 real matrix. Which of the following matrices is always symmetric? (a) A+ A (b) RREF(A) (c) AA' (d) A'AA

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7. Let A be a 32-by-48 real matrix. Which of the following matrices is always symmetric?

7. Let A be a 32-by-48 real matrix. Which of the following matrices is always symmetric?
(a) A + A
(b) RREF(A)
(c) AA
(d) A'AA
8. A square matrix P has a property that P2 = P. If P + Im, which of the following is true?
(a) P is singular.
(b) P is symmetric.
(c) P is skew-symmetric.
(d) P is an elementary matrix.
Transcribed Image Text:7. Let A be a 32-by-48 real matrix. Which of the following matrices is always symmetric? (a) A + A (b) RREF(A) (c) AA (d) A'AA 8. A square matrix P has a property that P2 = P. If P + Im, which of the following is true? (a) P is singular. (b) P is symmetric. (c) P is skew-symmetric. (d) P is an elementary matrix.
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