True-False Exercises TF. In parts (a)-(k) determine whether the statement is true or false, and justify your answer. (a) Two n x n matrices, A and B, are inverses of one another if and only if AB = BA = 0. (b) For all square matrices A and B of the same size, it is true that (A + B)? = A? + 2AB + B². (c) For all square matrices A and B of the same size, it is true that A – B = (A – B)(A + B). (d) If A and B are invertible matrices of the same size, then AB is invertible and (AB)- = A-'B-'.

Algebra and Trigonometry (6th Edition)
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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solve at least a to d subparts.if you dnt solve skip for another

True-False Exercises
TF. In parts (a)-(k) determine whether the statement is true or
false, and justify your answer.
(a) Two n x n matrices, A and B, are inverses of one another if
and only if AB = BA = 0.
(b) For all square matrices A and B of the same size, it is true that
(A + B) = A² + 2AB + B².
(c) For all square matrices A and B of the same size, it is true that
A? - B² = (A – B)(A + B).
(d) If A and B are invertible matrices of the same size, then AB is
invertible and (AB)-' = A-'B-'.
(e) If A and B are matrices such that AB is defined, then it is true
that (AB)" = A'B".
(f) The matrix
A =
is invertible if and only if ad – bc + 0.
(g) If A and B are matrices of the same size and k is a constant,
then (kA + B)" = kA" + B" .
(h) If A is an invertible matrix, then so is A".
(1) If p(x) = a, +a;x + azx² + ...+amx" and I is an identity
matrix, then p(1) = ao +a¡ +az + •·+ au-
(j) A square matrix containing a row or column of zeros cannot
be invertible.
(k) The sum of two invertible matrices of the same size must be
invertible.
Transcribed Image Text:True-False Exercises TF. In parts (a)-(k) determine whether the statement is true or false, and justify your answer. (a) Two n x n matrices, A and B, are inverses of one another if and only if AB = BA = 0. (b) For all square matrices A and B of the same size, it is true that (A + B) = A² + 2AB + B². (c) For all square matrices A and B of the same size, it is true that A? - B² = (A – B)(A + B). (d) If A and B are invertible matrices of the same size, then AB is invertible and (AB)-' = A-'B-'. (e) If A and B are matrices such that AB is defined, then it is true that (AB)" = A'B". (f) The matrix A = is invertible if and only if ad – bc + 0. (g) If A and B are matrices of the same size and k is a constant, then (kA + B)" = kA" + B" . (h) If A is an invertible matrix, then so is A". (1) If p(x) = a, +a;x + azx² + ...+amx" and I is an identity matrix, then p(1) = ao +a¡ +az + •·+ au- (j) A square matrix containing a row or column of zeros cannot be invertible. (k) The sum of two invertible matrices of the same size must be invertible.
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