Understanding Engineering Mathematics

(やまだぃちぅ) #1
3.a=−1,b=2,c=3,d=2,x=y=3,z= 2

4.θ= 30 °


  1. Additions


2 A=

[
4 − 2
60

]
2 B=

[ 6
− 2
8

]
2 C=[− 40 ]

2 D=

[ 02 − 2
406
− 2 − 64

]
2 E=

[ 68
− 24
06

]

2 F=

[
222
444

]
2 G=[ 420 ]

Multiplications

AF=

[
000
333

]
A^2 =

[
1 − 2
6 − 3

]
BG=

[ 630
− 2 − 10
840

]

CA=[− 42 ] CF=[− 2 − 2 − 2 ] D^2 =

[
331
− 3 − 74
− 8 − 7 − 4

]

DB=

[− 5
18
8

]
DE=

[− 1 − 1
617
0 − 4

]
EA=

[ 18 − 3
41
90

]

EF=

[ 11 11 11
333
666

]
FB=

[
6
12

]
FD=

[
1 − 24
2 − 48

]

FE=

[
29
418

]
GB= 5 GD=[ 421 ]

GE=[ 510 ]


  1. (i) Not possible (ii)


[
16 0
18 2
− 42

]
(iii)

[
88
33
2 − 5

]

(iv)

[ 11 10 15
12 9 30
51 − 7

]
(v) u,v,Bnot all same size

(vi)

[ 0
5
5

]
(vii)

[ 4
3
1

]

7.A,B,Care the matrices

A=

[
31
− 12

]
B=

[
2 − 10
312

]
C=

[
112
− 223

]

(B+C)A=BA+CA, indeed neither of(B+C)A,BA,orCAexist
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