Question

20) If x+1/x=4, then the value of
X2+1/x2 *
O
12
14
C
13​

Answer 1

Answer:

$x + \frac{1}{x} = 4 \\ {(x + \frac{1}{x}) }^{2} = 16 \\ {x}^{2} + \frac{1}{ {x}^{2} } + 2 \times x \times \frac{1}{x} = 16 \\ {x}^{2} + \frac{1}{ {x}^{2} } = 16 - 2 = 14$