x - y = 3 হলে x3 - y3 - 9xy -এর মান কত ?
A 9
B 18
C 27
D 36
Correct Answer: Option C
x3 -y3 -9xy
= (x-y)3 +3xy(x-y)-9xy
= 33 +3xy.3-9xy [ x-y = 3 বসিয়ে ] = 27+9xy-9xy = 27
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