Question

a^3-1/a^3if a-1/a=5​

Answer 1

Step-by-step explanation:

If a-1/a = 5 .

then, [a -1/a]^3 = (5)^3

a^3 - 1/a^3 - 3a×1/a(a - 1/a) = 125

a^3 -1/a^3 -3(5) = 125. (putting the value of a -1/a).

a^3 -1/a^3 -15 =125

a^3 - 1/a^3 = 125 + 15 = 140.

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Answer 2

Answer:

Its a good qstn.

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