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Question

If x3+1x3=110, then x+1x=

(a) 5

(b) 10

(c) 15

(d) none of these

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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 = 5 in the above equation we get

The Equation satisfy the condition that

Hence the value of is 5

The correct choice is (a).


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