Question

if x -1/x=9 find the value of x² plus 1/ײ​

Answer 1

Step-by-step explanation:

Hi,

X - 1 / X = 9

On Squaring both sides , we get

( X - 1/X)² = 9²

We know that ,

( a - b )² = a² + b² - 2ab.

Here , a = x and b = 1/x

Therefore

( x - 1/x )² = 9²

x² + 1/x² - 2* x * 1/ x = 81

x² + 1/x² - 2 = 81

x² + 1/x² = 81 + 2

x² + 1/x² = 83.

Hope it will help you :)