Math Matrix Worksheet - Math 205 A B, Quiz 4, 2012
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1Quiz 04 page 1
10/12/2012
Math 205 A B
Name
c s 2
5
3
1
36
36
a
1. Suppose M =
, N =
5
and M N =
.
c
t
20 10 b
280 240
z
c 3 3
Find the values of all those unknowns. Hint: it will be easy if you find them in more-or-less alphabetical order. There are
many equations you can write down, but aim for those with as few unknowns as possible.
Answers: a =
b =
c =
s =
t =
z =
BONUS: How many pairs of numbers have to multiplied to find the product of a 3 × 7 by a 7 × 10 matrix? Explain. (No
credit for a guess).
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