x-y = 10 এবং xy = 30 হলে x3-y3এর মান কত?

A 1700

B 1800

C 1900

D 1650

Solution

Correct Answer: Option C

দেওয়া আছে, x-y=10
এবং, xy =30
∴x3 - y3 = (x-y)3 + 3xy(x-y)
             = (10)3 + 3.30.10
             = 1000 + 900
             = 1900

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