Question

if x= 3-√8 Then find the value of x² - 1/x²​

Answer 1

Answer:

x=3-√8

x²=(3-√8)²

=9+8-6√8

=17-6√8

1/x²

=1/(17-6√8)

=17+6√8/289-288

=17+6√8

Now, x²-1/x²

=(17-6√8)-(17+6√8)

=17-6√8-17-6√8

=-12√8

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