Question on: JAMB Mathematics - 1990

If x + (\frac{1}{x}) = 4, find x2 + (\frac{1}{x^2})

A
16
B
14
C
12
D
9
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Correct Option: B

x + (\frac{1}{x}) = 4, find x2 + (\frac{1}{x^2})

= (x + (\frac{1}{x}))2 = x2 + (\frac{1}{x^2}) + 2

x2 + (\frac{1}{x^2}) = ( x + (\frac{1}{x^2}))2 - 2

= (4)2 - 2

= 16 - 2

= 14

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