Question

if x + 1 by x = 4 then calculate the value of x square + 1 by x square

Answer 1

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