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Question

If (x2+1x2=7) , find x1x


A

±(5)

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B

5

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C

-5

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D

±(7)

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Solution

The correct option is A

±(5)


Given
(x2+1x2=7)
x1x
Squaring we get
(x1x)2 = x2+1x22 (Using (a+b)2)
= (72)
= 5
Taking Square root on both sides , we get
(x1x) = ±(5)



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