Page 63 - Bangladesh_classwiz_BOOK2018_rev_Neat

(Key log- w9[p4=a[p4R[=p10=10=1

==)

1
1
1
2. (1 + ) ( ⁄ ) ( ⁄ ) ( ⁄ )
3 + (1 − )
3 = 2
3 mgxKiYwUi mgvavb Ki‡Z n‡e|
mgvavb- G‡K Solve evUb Øviv mgvav‡bi Rb¨ cÖ_‡g wb‡Pi w¯Œ‡bi g‡Zv K‡i K¨vjKy‡jU‡i UvBc Kiv n‡jv|

Gici qr evUb Pvc‡Z n‡e|

Gi gvb 1 cÖ‡ek Kwi‡q = evUb Pvc‡j GKwU mgvavb = −1 cvIqv hv‡e| Avevi = evUb ‡P‡c gvb−5
cÖ‡ek Kiv‡j wØZxq w¯Œ‡bi g‡Zv = −1 cvIqv hv‡e|

(Key log- w1(1+[)^a1R3$$+(1p[)^a
1R3$$Qr2^a1R3qr 1===p5==)

myZivs = 1 I = −1 mgxKiYwUi mgvavb|

3. √( + 4) + √( + 11) = √(8 + 9)

mgvavb- mgxKiYwU mgvav‡bi Rb¨ cÖ_‡g w9 ‡P‡c Table mode G wb‡Z n‡e| Gici mgxKi‡Yi
Í
evgc¶‡K ( ) Ges Wvbc¶‡K ( ) a‡i, Gi gvb −1 ‡_‡K 20 ch©š Ges e¨eavb 1 wb‡j wb‡Pi g‡Zv
ZvwjKv cvIqv hv‡e|

(Key log- w9s[+4$+s[+11$=s8[+9=p1

=20=1==)

ZvwjKvq ‡`Lv hv‡”Q = 5 Gi Rb¨ ( ) = ( ) = 7 myZivs = 5 n‡e mgxKiYwUi mgvavb|

58