যদি x - y = 8 এবং xy = 5 হয়, তবে x3 - y3 + 8(x + y)2 এর মান কত?
Solution
Correct Answer: Option C
x3 - y3 + 8(x + y)2
= (x - y)3 + 3xy (x - y) + 8{(x - y)2 +4xy}
= (8)3 + 3 × 5 × 8 + 8(82 + 4 × 5)
= 1304
= (x - y)3 + 3xy (x - y) + 8{(x - y)2 +4xy}
= (8)3 + 3 × 5 × 8 + 8(82 + 4 × 5)
= 1304
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