x - y = 3 হলে x3 - y3 - 9xy এর মান -
Solution
Correct Answer: Option A
দেওয়া আছে, x - y = 3
এখানে,
x3 - y3 - 9xy = (x - y)3 + 3xy(x - y) - 9xy
= 33 + 3xy × 3 - 9xy
= 27 + 9xy - 9xy
= 27
এখানে,
x3 - y3 - 9xy = (x - y)3 + 3xy(x - y) - 9xy
= 33 + 3xy × 3 - 9xy
= 27 + 9xy - 9xy
= 27
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