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Question

If (x1x)=6, then (x2+1x2)=?

(a) 36
(b) 38
(c) 32
(d) 36136

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Solution

(x1x)=6
Squaring both sides,
(x1x)2=(6)2x2+1x22=36x2+1x2=36+2=38


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