Page 64 - Bangladesh_classwiz_BOOK2018_rev_Neat

4. ( + 2)( − √3) = 0

mgvavb- cÖ_‡g K¨vjKy‡jU‡i wz ‡P‡c Equation/Function mode G wb‡q cici `yBevi 2 evUb ‡P‡c
2
wØNvZ mgxKiY wbe©vPb Kiv n‡jv| Gici mgxKiYwUi Abyiƒc mgxKiY + (2 − √3) − 2√3 = 0
mijxKiY K‡i wb‡Z n‡e| Zvici mnM¸‡jvi gvb 1, (2 − √3) I −2√3 h_vµ‡g K¨vjKy‡jU‡i cÖ‡ek Ki‡j
wb‡Pi w¯Œ‡bi g‡Zv mgxKi‡Yi mgvavb cvIqv hv‡e|

(Key log- wz221=(2ps3))=p2s3)===)

5. 50 wgUvi ‰`N¨© I 40 wgUvi cÖ¯’wewkó GKwU AvqZvKvi evMv‡bi wfZ‡ii Pviw`‡K mgvb PIov GKwU iv¯Ív

Av‡Q| iv¯Ív ev‡` evMv‡bi ‡¶Îdj 1200 eM©wgUvi n‡j iv¯ÍvwU KZ wgUvi PIov Zv ‡ei Ki‡Z n‡e|

mgvavb- awi,iv¯ÍvwU wgUvi PIov| iv¯Ív ev‡` evMvbwUi ‡¶Îdj n‡e (50 − 2 )(40 − 2 ) = 1200
2
eM©wgUvi| mgxKiYwUi Abyiƒc mgxKiY n‡e − 45 + 200 = 0. GB mgxKiYwU mgvav‡bi Rb¨ cÖ_‡g
K¨vjKy‡jU‡i c~‡e©i D`vni‡Yi g‡Zv wØNvZ mgxKiY wbe©vPb K‡i mnM¸‡jvi gvb h_vµ‡g 1, −45 I 200 cÖ‡ek

Kiv‡Z n‡e| Gici = evUb Pvc‡j wb‡Pi `yBwU w¯Œ‡bi g‡Zv Gi gvb cÖ`k©b Ki‡e|

(Key log- wz221=p45=200===)

GLv‡b = 40 Ges = 5 wKš‘ iv¯Ívi PIov Aek¨B evMv‡bi cÖ¯’ ‡_‡K Kg n‡e| myZivs = 5 B n‡e
1
2
mgm¨vwUi mgvavb|

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