Page 38 - Bangladesh_classwiz_BOOK2018_rev_Neat

GB `yBwU wbw`©ó dvsk‡bi R‡b¨ = 0 GKwU Amxg‡ZvU ‡iLv| dvsk‡bi gvb 0 Gi wbKUeZ©x n‡Z _v‡K, wKš‘

KL‡bvB 0 ‡Z ‡cŠQvqbv| Amxg‡ZvU ‡iLv D”PZi MwY‡Z LyeB ¸iæZ¡c~Y© Ges g~j` dvsk‡bi ‡¶‡Î GwU ‡`Lv hvq|
g~j` dvskb ‡h‡nZy fMœvsk AvKv‡ii dvskb ZvB Gi n‡ii gvb KL‡bv k~b¨ n‡Z cv‡ibv| ‡Kbbv n‡ii gvb k~b¨

n‡j dvskbwUi gvb AmsÁvwqZ n‡q hvq| Gi ‡hmKj gv‡bi Rb¨ n‡ii gvb k~b¨ n‡q hvq H mKj gvb dvskbwUi
‡Wv‡g‡bi AšÍf©~³ nqbv| ‡hgb ( ) = 1 dvskbwUi gvb = 3 Gi Rb¨ AmsÁvwqZ| ZvB dvskbwUi
−3
‡Wv‡gb n‡e − {3}| Avi ‡Wv‡g‡bi mKj gv‡bi Rb¨ cÖvß gvb¸‡jv n‡jv dvsk‡bi ‡iÄ|

GKB fv‡e ( ) = √(1 − ) dvsk‡bi ‡Wv‡gb n‡e ≤ 1, ‡Kbbv Gi gvb hw` 1 Gi PvB‡Z eo nq
Zvn‡j dvskbwUi gvb RwUj msL¨v nq|

2.7 m‡e©v”P I me©wbgœgvb

eûNvZ wewkó dvsk‡bi m‡e©v”P A_ev me©wbgœ gvb _v‡K| wØNvZ dvsk‡bi m‡e©v”P A_ev me©wbgœgvb _v‡K, ‡hLv‡b
wÎNvZ dvskb ¸‡jvi DfqB _vK‡Z cv‡i , hv dvsk‡bi ‡jLwP‡Î ÔjycÕ (Pµ) Øviv wb‡`©wkZ nq|
( ) = 3 − 2 ³ − 1Gi ‡jLwP‡Î (QR ‡Kv‡Wi gva¨‡g cÖvß) ‡`Lv hvq, = 0 Ges = 1Gi g‡a¨
dvsk‡bi GKwU m‡e©v”P gvb i‡q‡Q Ges = −1 Ges = 0 Gi g‡a¨ GKwU me©wbgœ gvb i‡q‡Q|

সর্বোচ্চ মোন

স্বননম্ন মোন

j¶Yxq ‡h, GB gvb¸‡jv AvcvZ`…wó‡Z ïaygvÎ Ôm‡e©v”PÕ A_ev Ôme©wbgœÕ gvb| D`vnviY¯^iƒc ejv hvq, < −2
Gi Rb¨ dvsk‡bi gvb = 0 I = 1 Gi wfZ‡ii ‡h‡Kv‡bv gv‡bi ‡P‡q e…nËg| G‡¶‡Î = 0 Ges = 1
Gi wfZ‡i GKwU Pig gvb i‡q‡Q|

gv‡bi ZvwjKvq GKwU ¶y`« e¨ewai g‡a¨ dvsk‡bi m‡e©v”P I me©wbgœgvb ch©‡e¶Y Kiv myweavRbK| G‡¶‡Î

( ) = 3 − 2 ³ − 1Gi gvb = 0 Ges = 1 e¨ewai g‡a¨ ‡bqv n‡q‡Q|

gv‡bi ZvwjKv n‡Z ‡`Lv hvq ‡h, = 0.6 Ges = 0.8 Gi g‡a¨ dvsk‡bi GKwU m‡e©v”P gvb i‡q‡Q|

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