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What will be the value of $x + 1 x$ , $if x 2 + 1 x 2 = 79$ , ?

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answer is A.

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Detailed Solution

Given,

x 2 + 1 x 2 = 79

We have to find the value of

x + 1 x

.
Using the formula,

a 2 + b 2 + 2 a b = a + b 2

Adding 2 to both sides in given equation,
Question Image

So, the value of

x + 1 x = 9

.
Therefore, option 1 is correct.

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