Page 121 - Bangladesh_classwiz_BOOK2018_rev_Neat

Abykxjbx-10

1. wb‡Pi g¨vwUª·¸‡jv jÿ¨ Ki-

1 2 3 −1 9
= [ ] = [ ]
3 −4 2 4 5
3
2 −3
= [ ] = [4]
1 −5
2

K¨vjKz‡jU‡ii mvnv‡h¨ †ei Ki (‡ei Kiv bv †M‡j, †Kb m¤¢e bq e¨vL¨v Ki)

(i) 5 (ii) + (iii) (iv) (v)

6
2
−1
(vi) (vii) (viii)
2 5
2. (i) K¨vjKz‡jUi e¨envi K‡i = ( 1) g¨vwUª·wUi wbY©vq‡Ki gvb †ei Ki|
1
2
(ii) Edit matrix e¨envi K‡i g¨vwUª·wUi fMœvsk Dcv`vb‡K 3 Øviv cÖwZ¯’vcb K‡i bZzb g¨vwUª‡·i wbY©vq‡Ki
gvb †ei Ki|
−1
3. hw` = nq Zvn‡j = . K¨vjKz‡jU‡i g¨vwUª· e¨envi K‡i wb‡Pi mij mn mgxKiY¸‡jv
mgvavb Ki-

(i) 3 − 2 = 2

+ 5 = 29

(ii) 1.2 − 4 = 0.62

1.6 − 2.8 = 1.46

(iii) + 4 − = −2

3 − + 3 = 19

−2 + + = −7

(iv) 3 − + 4 = 15

− + = 0

+ 4 − 2 = 17

4. nv‡mg Avjx jÿ¨ Ki‡jv 4 Kvc Kwd I 3 Kvc Pv Gi Rb¨ †gvU 26 UvKv LiP nq Ges 2 Kvc Kwd I 5 Kvc
Pv Gi Rb¨ 27 UvKv LiP nq| K¨vjKz‡jU‡i Matrix e¨envi K‡i cÖwZ Kvc Kwd I Pv Gi `vg KZ n‡e Zv †ei
Ki|

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