Matrix multiplication
�
1. Let A =
⎛
⎞
�
�
�
�
�
� �
1 4
1 3
1 1 1
3
0
5
, B=
, C = ⎝ 1 5 ⎠, D =
, E=
.
4 5
4 5 6
0 3
3
1 6
For each of the following say whether it makes sense to compute it. If it makes sense then
do the computation.
(i) AA (ii) AB (iii)
⎛
a b
2. Let A = ⎝ d e
g h
column of A).
AC (iv) AE (v) DA (vi) CE (vii) A + B (viii) A + D.
⎞
⎛ ⎞
c
b
f ⎠. Find a column vector B such that AB = ⎝ e ⎠ (the middle
i
h
3. Write the following system in matrix form
2x + 3y + 5z = 2
2y + z = 1
x − 2y +
= 3.
MIT OpenCourseWare
http://ocw.mit.edu
18.02SC Multivariable Calculus
Fall 2010
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