3 2 1. A = 4 3 } ], b = [ 3 ] 5 6 THEOREM 2 Inverses of 2 x 2 Matrices The 2 × 2 matrix A = [a b] is invertible if and only if ad - - bc 0, in which case 1 d-b A = ad - bc [ (9) -C a

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
Chapter7: Applying Fractions
Section7.5: Percents
Problem 14WE
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First, apply the formulas in (9) to find A-1. Then use A-1 to solve the system Ax=b.

3
2
1. A =
4
3
} ], b = [ 3 ]
5
6
Transcribed Image Text:3 2 1. A = 4 3 } ], b = [ 3 ] 5 6
THEOREM 2 Inverses of 2 x 2 Matrices
The 2 × 2 matrix
A
= [a b]
is invertible if and only if ad
-
- bc 0, in which case
1
d-b
A
=
ad - bc
[
(9)
-C
a
Transcribed Image Text:THEOREM 2 Inverses of 2 x 2 Matrices The 2 × 2 matrix A = [a b] is invertible if and only if ad - - bc 0, in which case 1 d-b A = ad - bc [ (9) -C a
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