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★Heya★
x + 1/x = 2
CUBING ON BOTH SIDES WE HAVE
( x + 1/x )³ = 2³
=>
x³ + 1/x³ + 3 ( x ) ( 1/x ) ( x + 1/x ) = 8
Becoz
( a + b )³ = a³ + b³ + 3ab ( a + b )
=>
x³ + 1/x³ + 3 ( 2 ) = 8
=>
x³ + 1/x³ = 8 -6
=>
x³ + 1/x³ = 2
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