if a+1/a=5 then find the value of a3+1/a3.
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a + (1/a) = 5
⇒ (a + 1/a)3 = (5)3
⇒ a3 + (1/a3) + 3a × (1/a) (a + (1/a)) = 125
⇒ a3 + (1/a3) + 3(5) = 125 [a + (1/a) = 5]
⇒ a3 + (1/a3) + 15 = 125
⇒ a3 + (1/a3) = 125 – 15
⇒ a3 + (1/a3) = 110
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