16
14
12
9
Correct answer is B
x + 1x = 4, find x2 + 1x2
= (x + 1x)2 = x2 + 1x2 + 2
x2 + 1x2 = ( x + 1x2)2 - 2
= (4)2 - 2
= 16 - 2
= 14
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