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Question

If x3 - 1x3=14, then x-1x =

(a) 5

(b) 4

(c) 3

(d) 2

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Solution

In the given problem, we have to find the value of

Given

We shall use the identity

Put we get,

Substitute y = 2 in above equation we get,

The Equation satisfy the condition that

Hence the value of is 2

Hence the correct choice is (d).


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