Page 50 - Bangladesh_classwiz_BOOK2018_rev_Neat

Dc‡ii w¯Œ‡b †`Lv hv‡”Q †h, = 7 I = −5
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myZivs Dc‡ii ivwki Drcv`‡K we‡køwlZ iƒc n‡e ( − 7)( + 5).

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A_©vr − 2 − 35 = ( − 7)( + 5).

`ªóe¨: hw` Gi gvb fMœvsk AvKv‡i Av‡m Zvn‡j ni‡K Gi mv‡_ ¸Y K‡i Zv †_‡K je we‡qvM AvKv‡i wjL‡Z
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n‡e| †hgb- = 7 bv n‡q hw` = n‡Zv Zvn‡j Drcv`‡K we‡køwlZ iƒc n‡Zv (2 − 7)( + 5).
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3.4 fvM‡kl †ei Ki‡Z store dvsk‡bi e¨envi-

fvM‡kl Dccv`¨ Abyhvqx ( ) †K ( − ) Øviv fvM Ki‡j fvM‡kl nq ( ). ClassWiz Gi gva¨‡g
fvM‡k‡li gvb †ei Kivi Rb¨ cÖ_‡g Gi gvb K¨vjKz‡jU‡ii †g‡gvwi‡Z msiÿY Ki‡Z nq| Gici ivwkwU‡K
cÖ‡ek Kwi‡q = evUb Pvc‡j K¨vjKz‡jUi †h djvdj cÖ`k©b Ki‡e Zv fvM‡k‡li gvb|

D`vniY¯^iƒc, 6 − 7 + 5 ‡K ( − 1) Øviv fvM Ki‡j fvM‡kl KZ _v‡K Zv †ei Kivi Rb¨ cÖ_‡g J
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Kx e¨envi K‡i 1 †K †g‡gvwi‡Z msiÿY Ki‡Z n‡e|

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Zvici 6 − 7 + 5 K¨vjKz‡jU‡i cÖ‡ek Kwi‡q = evUb Pvc‡j fvM‡k‡li gvb wb‡Pi w¯Œ‡bi g‡Zv cÖ`wk©Z
n‡e| G‡ÿ‡Î fvM‡kl n‡jv 4.

3.5 k~b¨vqb c×wZ‡Z (Vanishing method) Drcv`‡K we‡kølY

k~b¨vqb c×wZ‡Z Drcv`‡K we‡kølY Kivi Rb¨ ivwkwU‡Z †h aªæeK gvbwU _v‡K cÖ_‡g †mwUi Drcv`K¸‡jv †ei K‡i
wb‡Z nq| Gici Drcv`K¸‡jvi abvZ¥K I FYvZ¥K Dfq gv‡bi Rb¨ ivwkwUi gvb †Kgb Av‡m Zv wbixÿv K‡i

†`L‡Z nq| †h gv‡bi Rb¨ ivwkwUi gvb k~b¨ n‡e Zv Gi mv‡_ we‡qvM AvKv‡i wjL‡j hv cvIqv hv‡e †mwU n‡e
D³ ivwkwUi GKwU Drcv`K|
ClassWiz Gi gva¨‡g Lye mn‡RB ‡Kv‡bv msL¨vi †gŠwjK Drcv`K (Factor) ‡ei Kiv hvq| G Rb¨ FACT

(qx) wb‡`©kbv e¨envi Ki‡Z nq| D`nviY¯^iƒc, 6 Gi †gŠwjK Drcv`K¸‡jv K¨vjKz‡jUi cÖ`k©b Ki‡e|

Dc‡ii w¯Œ‡b †`Lv hv‡”Q †h, 6 Gi †gŠwjK Drcv`K ¸‡jv n‡jv 2 I 3 |

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Avevi aiv hvK, 12 Gi Drcv`K †ei Kivi †ÿ‡Î K¨vjKz‡jUi djvdj cÖ`k©b Ki‡e 2 × 3| A_©vr 12 Gi
†gŠwjK Drcv`K n‡jv 2 I 3| Avevi 16 Gi †gŠwjK Drcv`K n‡e ïaygvÎ 2|

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