6. Read the whole problem before you answer the questions within. Recall that: Given a square matrix T , and a positive integer k = 1,2.., the kh -power of T is the matrix obtained by multiplying T by itself k-times, using matrix multiplication. That is, Tk = T·T.....T k-times, where · stands for matrix multiplication In this problem, we consider the matrices 5 0 D = D-; :) p-1 A = -1 3 P = -1 and Indeed, the matrices A and D are related as follows A = PDP-'. (*) You can use the fact stated in (*) and you DO NOT need to verify it during this test. (a) Use (*) to show that A? = PD²P-l holds. (b) Is the statement Ak = PD*P¯' true for any positive integer k > 3? Explain (briefly). (c) Compute the matrix D² and then find a formula for the matrix D“, for all k > 3. The entries of the matrix Dk should be expressed in terms of the power k. (d) Use parts (b) and (c) to compute A1º. You may leave the entries of A1º as powers of certain numbers, but the output has to be a single 2 x 2 matrix. (e) Find a formula for A' (your output is a 2 × 2 matrix whose entries are to be deter- mined, in terms of k).

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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6. Read the whole problem before you answer the questions within.
Recall that: Given a square matrix T , and a positive integer k = 1,2.., the kh -power of
T is the matrix obtained by multiplying T by itself k-times, using matrix multiplication.
That is,
Tk =
T·T.....T
k-times, where · stands for matrix multiplication
In this problem, we consider the matrices
5 0
D =
D-; :)
p-1
A =
-1 3
P =
-1
and
Indeed, the matrices A and D are related as follows
A = PDP-'.
(*)
You can use the fact stated in (*) and you DO NOT need to verify it during this test.
(a) Use (*) to show that A? = PD²P-l holds.
(b) Is the statement Ak = PD*P¯' true for any positive integer k > 3? Explain (briefly).
(c) Compute the matrix D² and then find a formula for the matrix D“, for all k > 3. The
entries of the matrix Dk should be expressed in terms of the power k.
(d) Use parts (b) and (c) to compute A1º. You may leave the entries of A1º as powers of
certain numbers, but the output has to be a single 2 x 2 matrix.
(e) Find a formula for A' (your output is a 2 × 2 matrix whose entries are to be deter-
mined, in terms of k).
Transcribed Image Text:6. Read the whole problem before you answer the questions within. Recall that: Given a square matrix T , and a positive integer k = 1,2.., the kh -power of T is the matrix obtained by multiplying T by itself k-times, using matrix multiplication. That is, Tk = T·T.....T k-times, where · stands for matrix multiplication In this problem, we consider the matrices 5 0 D = D-; :) p-1 A = -1 3 P = -1 and Indeed, the matrices A and D are related as follows A = PDP-'. (*) You can use the fact stated in (*) and you DO NOT need to verify it during this test. (a) Use (*) to show that A? = PD²P-l holds. (b) Is the statement Ak = PD*P¯' true for any positive integer k > 3? Explain (briefly). (c) Compute the matrix D² and then find a formula for the matrix D“, for all k > 3. The entries of the matrix Dk should be expressed in terms of the power k. (d) Use parts (b) and (c) to compute A1º. You may leave the entries of A1º as powers of certain numbers, but the output has to be a single 2 x 2 matrix. (e) Find a formula for A' (your output is a 2 × 2 matrix whose entries are to be deter- mined, in terms of k).
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