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) [মান বসিয়ে]
=83+15 × 8 +8 (64 +20) =83+15 × 8 +8 × 84 = 8 82 + 15 + 84 = 8 64+ 15 + 84 = 8 × 163 = 1,304
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