If 2 4 6 x 14 28 30
Then, x³+ 2 x+1 = ?
2(× 2), 4(+2), 6 (× 2), 12 (+2), 14 (× 2), 28 (+2), 30 Hence, x= 12 Hence, x³+ 2 x +1 = (12)³+ 2 × 12 + 1 = 1,728 + 24 + 1 = 1,753
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