x - y = 7 এবং xy = 15 হলে, (x2 + y2 ) (x3 - y3 ) এর মান কত ?
Correct Answer: Option B
1st rashi : x2 +y2 = (x-y)2 + 2xy
= 72 +2.15 = 49 + 30 = 79
2nd rashi : x3 - y3 = (x - y)3 + 3xy (x-y)
= (7)3 + 3.15.7 = 343 + 315 = 658
(x2 + y2 ) (x3 - y3 ) = 79 \( \times \)658 = 51982
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