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Math 20F  Linear Algebra  Winter 2003
Quiz #2 — January 21
(Do not discuss quiz with students who haven’t taken it yet – until 8:00pm.)
1. Let
A
=
±
123

10

1
¶
.
(a) What is
A
T
?
ANSWER:
A
T
=
1

1
20
3

1
(b) Compute
AA
T
.
ANSWER:
AA
T
=
±
14

4

42
¶
(c) Does
A
have an inverse? Explain why or why not. (Watch out for
this being a ‘trick’ question!)
ANSWER: No,
A
is not invertible, since
A
is not square.
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This homework help was uploaded on 01/23/2008 for the course MATH 20F taught by Professor Buss during the Winter '03 term at UCSD.
 Winter '03
 BUSS
 Linear Algebra, Algebra

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