Page 37 - Bangladesh_classwiz_BOOK2018_rev_Neat

KviY ni k~b¨ n‡j Zvi gvb AmsÁvwqZ nq, ZvB (0) Ges (1) Gi gvb ‡bB| †mRb¨ K¨vjKy‡jUi Dfq‡¶‡Î
ERROR ‡`Lvq|

GB ai‡bi wew”QbœZvi ‡¶‡Î g~j` dvsk‡bi ‰ewkó¨ n‡jv ‡h G‡`i gvb GB Aby‡”Q‡` Av‡jvP¨ Ab¨vb¨ dvsk‡bi
g‡Zv mnR Ges wbiwew”Qbœfv‡e cwiewZ©Z nq bv| eis ÔnVvrÕ cwiewZ©Z nq, hvi d‡j GB ai‡bi dvsk‡bi `yBwU
Avjv`v ‡jLwPÎ _v‡K|

y
Dc‡ii g~j` dvskb we‡ePbv Ki‡j, wKQ ZvwjKve× gvb GB NUbv `…k¨gvb K‡i| wb‡Pi w¯Œb¸‡jv fv‡jv K‡i j¶¨
Kiv hvK

ZvwjKve× gvb¸‡jv ch©‡e¶‡Y GwU cÖZxqgvb nq ‡h > 0 Gi Rb¨ ( ) Gi gvb abvZ¥K Ges < 0 Gi
Rb¨ ( )Gi gvb FYvZ¥K| Aciw`‡K > 1 Gi R‡b¨ ( )Gi gvb abvZ¥K Ges < 1Gi Rb¨ ( )Gi
gvb FYvZ¥K| GQvov Av‡iv cÖZxqgvb nq ‡h, 0 Gi Dfq cv‡k ( ) Gi gvb G‡K Ac‡ii wecixZ, hv wb‡`©k
K‡i = 0 ‡Z dvskbwU cÖwZmg| ( ) Gi gvb wb‡`©k K‡i ‡h GwU = 1 Gi mv‡c‡¶ cÖwZmg| GB ai‡bi

gv‡bi ZvwjKv ‡jL KvM‡R dvsk‡bi ‡jLwPÎ AsKb Ki‡Z mvnvh¨ K‡i| QR ‡KvW n‡Z cÖvß GB `yBwU dvsk‡bi
‡jLwP‡Î GB ai‡bi ‰ewk󨸇jv cÖZxqgvb nq|

g~j` dvsk‡bi Av‡iKwU ‰ewkó¨ n‡jv Gi Amxg abvZ¥K I FYvZ¥K gv‡bi Rb¨ dvsk‡bi gvb = 0 Gi
KvQvKvwQ Ae¯’vb K‡i| gvb¸‡jv KL‡bvB k~b¨ nq bv eis > 0 Gi Rb¨ Zv memgqB abvZ¥K Ges < 0 Gi
Rb¨ memgqB FYvZ¥K| A‡bK eo gvb wb‡q ch©‡e¶Y Ki‡j GwU ‡evSv hvq| wb‡Pi D`vniY¸‡jv‡Z Zv ‡`Lv‡bv
n‡jv-

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