Q. 12

If x + = 4, then x+ =
A. 2

B. 4

C. 8

D. 1

Answer :

Given x +√15 = 4


X = 4 - √15


1/x = 1/(4 - √15) = (4 + √15) / 16 -15 = 4 + √15


So, x + 1/x = 4 - √15 + 4+√15 = 8

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