-(÷) If A = 2 -1 -1 B = find (a) A +B, (b) A - B, 2 -4 -2 -1 (c) 2A - 3C, (d) 3A + 2B - 4C, (e) AB, BA, (9) (AB)C, (k) A(BC), (1) AT + B",

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter2: Working With Real Numbers
Section2.4: Subtracting Real Numbers
Problem 62WE
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Н.W
1. If A =
/2-1
B =
-1
1
C =
1
find (a) A + B, (b) A- B,
2 -4
(e) 24 - 3C, (d) 3А + 2B - 4С, (е) АВ, ) BА, (0) (АВ)С. () A(ВC), () AT + B",
) BA".
2 1 -1
1 -2 3
-2 1 2
1 -1
-2 1 3
2. If A =
B =
show that
2 -1
1
(А + By 3
A + AB + BA + B
3. prove that:
det (AB) = det (A) det (B)
If
2
A =
B =
--3 4
/3-2
4. (a) Find the inverse of the matrix A =
direct multiplication.
1
2 -8
and (b) check the answer by
5. Solve the system of equations
3x, - 2x + 2x, = 10
1 + 2x2 - 3xs = -1
4x + xa + 2x3 =
3
(a) by Cramer's rule and (b) by using inverse matrices.
(3x, - 2x2 + 2x, = 0
2 + 2x - 3xs = 0. by Cramer's rule
421 + :+ 2x, = 0
6. Solve
7. For what values of k will the system
2z + ky + z = 0
(k - 1)z - y + 2z = 0
4z + y+4z = 0
have non-trivial solutions?
Solving formally by Cramer's rule.
Transcribed Image Text:Н.W 1. If A = /2-1 B = -1 1 C = 1 find (a) A + B, (b) A- B, 2 -4 (e) 24 - 3C, (d) 3А + 2B - 4С, (е) АВ, ) BА, (0) (АВ)С. () A(ВC), () AT + B", ) BA". 2 1 -1 1 -2 3 -2 1 2 1 -1 -2 1 3 2. If A = B = show that 2 -1 1 (А + By 3 A + AB + BA + B 3. prove that: det (AB) = det (A) det (B) If 2 A = B = --3 4 /3-2 4. (a) Find the inverse of the matrix A = direct multiplication. 1 2 -8 and (b) check the answer by 5. Solve the system of equations 3x, - 2x + 2x, = 10 1 + 2x2 - 3xs = -1 4x + xa + 2x3 = 3 (a) by Cramer's rule and (b) by using inverse matrices. (3x, - 2x2 + 2x, = 0 2 + 2x - 3xs = 0. by Cramer's rule 421 + :+ 2x, = 0 6. Solve 7. For what values of k will the system 2z + ky + z = 0 (k - 1)z - y + 2z = 0 4z + y+4z = 0 have non-trivial solutions? Solving formally by Cramer's rule.
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