Question

if x=3-2√2,then find X² +1/x²​

Answer 1

Answer:

x = 3 - 2√2 ----( 1 )

1/x = 1/( 3 - 2√2 )

= ( 3 + 2√2 ) / [ ( 3 - 2√2 )(3+2√2 )]

= ( 3 + 2√2 ) / [ 3² - ( 2√2 )² ]

= ( 3 + 2√2 ) / ( 9 - 8 )

= 3 + 2√2 ----( 2 )

x + 1/x = 3 - 2√2 + 3 + 2√2

= 6 ------( 3 )

x - 1/x = 3 - 2√2 - ( 3 + 2√2 )

= 3 - 2√2 - 3 - 2√2

= - 4√2 ---- ( 4 )

Now ,

x² - 1/x² = ( x + 1/x ) ( x - 1/x )

= 6 × ( - 4√2 )

[ From ( 3 ) and ( 4 ) ]

= - 24√2

Step-by-step explanation:

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