1 4 A = find (a) A +B, (b) A-B, -2 (e) 24 – 3C, (d) SA + 2B - 4C, (e) AB, S BA, G) (AB)C, (A) A(BC), () A + B",

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
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Chapter2: Systems Of Linear Equations
Section2.4: Applications
Problem 26EQ
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2 %AY l, li,
UU O
H.W ch1.pdf
->
Н.W
2 -1
-1
1. If A =
C =
-2
find (a) A + B, (b) A - B,
B
3
(e) 24 - 8C, (а) ЗА + 28- 4С, (е) АВ, () ВА, (0) (АB)С, (К) А(ВC), () АT + вт,
O B'AT.
2
1-1
1 -1
2
2 If A =
1 -2
B =
-2
1
3
show that
-2
1
2
2 -1
1
(A + B)*
A + AB + BA + B
%3D
3. prove that:
det (AB) = det (A) det (B)
If
2 -1
B =
-3
A =
/3-2
2
1 2 -3
4. (e) Find the inverse of the matrix A =
direct multiplication.
and (b) check the answer by
1.
5. Solve the system of equations
3z - 2r + 2z, = 10
: + 2- 3s = -1
4: + a+ 2x, =
3.
(a) by Cramer's rule and (b) by using inverse matrices.
(3z, - 2x + 2z. = 0
z, + 21 - 3z = 0.
4, + + 2z, = 0
6. Solve
by Cramer's rule
7. For what values of k will the system
2r + ky + z =0
(k- 1)z - y+2 = 0
4r + y+4z 0
have non-trivial solutions?
Solving formally by Cramer's rule
II
>
Transcribed Image Text:2 %AY l, li, UU O H.W ch1.pdf -> Н.W 2 -1 -1 1. If A = C = -2 find (a) A + B, (b) A - B, B 3 (e) 24 - 8C, (а) ЗА + 28- 4С, (е) АВ, () ВА, (0) (АB)С, (К) А(ВC), () АT + вт, O B'AT. 2 1-1 1 -1 2 2 If A = 1 -2 B = -2 1 3 show that -2 1 2 2 -1 1 (A + B)* A + AB + BA + B %3D 3. prove that: det (AB) = det (A) det (B) If 2 -1 B = -3 A = /3-2 2 1 2 -3 4. (e) Find the inverse of the matrix A = direct multiplication. and (b) check the answer by 1. 5. Solve the system of equations 3z - 2r + 2z, = 10 : + 2- 3s = -1 4: + a+ 2x, = 3. (a) by Cramer's rule and (b) by using inverse matrices. (3z, - 2x + 2z. = 0 z, + 21 - 3z = 0. 4, + + 2z, = 0 6. Solve by Cramer's rule 7. For what values of k will the system 2r + ky + z =0 (k- 1)z - y+2 = 0 4r + y+4z 0 have non-trivial solutions? Solving formally by Cramer's rule II >
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