দেওয়া আছে, x2 - 1x23 = x + 1x x - 1x3
এখানে x + 1x2 = 5 বলে
⇒ x + 1x = 5 হবে
আবার আমরা জানি, x - 1x2 = x2 + 1x2 - 2 × x + 1x = 3-2 = 1
∴ x - 1x = 1 = 1
অতএব, x + 1x x - 1x3= 5 × 13 = 53 = 55 answer
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