Question

plz answer me...................​

Answer 1

Answer:

the answer of this question is 28

Answer 2

$\huge{ \: \: \red{given}</p><p>: }</p><p> \\ \\ \\ \large{x + \frac{1}{x} } = 30 \\ \\ {\green{to \: \: find : }</p><p>} \: \: \: \: \: \: \: \: \: \: \: {x}^{2} + \frac{1}{ {x}^{2} } \\ \\ </p><p>\blue{solution : } \: \: \: \: \: \: \: \: \: \: \: \\ \\ x + \frac{1}{x} = 30 \\ \\ </p><p>\pink{squaring \: \: \: on \: \: \: both \: \: side}</p><p> \\ \\ ( {x + \frac{1}{x} })^{2} = {30}^{2} \\ \\ {x}^{2} + 2 \times x + \frac{1}{x} + \frac{1}{ {x}^{2} } = 900 \\ \\ {x}^{2} + 2 + \frac{1}{ {x}^{2} } = 900 \\ \\ {x}^{2} + \frac{1}{ {x}^{2} } = 900 - 2 \\ \\ {x}^{2} + \frac{1}{ {x}^{2} } = 898 \\ \\ \pink{hence } \\ \\ \: {x}^{2} + \frac{1}{ {x}^{2} } = 898$