Question

x-1/x=4 find x^2-1/x^2=?

Answer 1

$\mathbb{ \green{ \fbox {\fbox{ \color{red}{TOPIC:- LINEAR \: \: EQUATION}}}}}$



$\mathbb{ \fbox{ \color{red}{QUESTION:-}}}$



$\bold{x - \frac{1}{x} } = 4$


Here,

Squaring On the both Sides. It's meant Squaring on Left-hand side and Right hand Sides:-



$\bold{( {x - \frac{1}{x} )}^{2} = {4}^{2} } \\ \\ \\ \\ {x}^{2} + \frac{1}{ {x}^{2} } - 2 \cancel{x} \times \frac{1}{ \cancel{x}} \\ \\ \\ \\ \\ \\ {x}^{2} + \frac{1}{ {x}^{2} } - 2 = 16 \\ \\ \\ \\ \\ {x}^{2} + \frac{1}{ {x}^{2} } = 2 + 16 \\ \\ \\ \\ {x}^{2} + \frac{1}{ {x}^{2} } = 18$




Thank You!!!!!

Answer 2

hope it helps u.
Hey u r in now which ch. And u r following which book? And one think r question is not proper something went wrong ook