Question

Pls ans que 5.... Give steps. Best ans will be marked brainliest ✨✨.

Answer 1

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We know the algebraic identity:

a³ + b³ + 3ab( a + b ) = ( a + b )³

Or

a³ + b³ = ( a + b )³ - 3ab( a + b )

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Here ,

x + 1/x = √3 ----( 1 )

Now ,

x³ + 1/x³ = ( x + 1/x )³ - 3.x.1/x(x + 1/x )

= ( √3 )³ - 3( √3 ) [ from ( 1 ) ]

= 3√3 - 3√3

= 0

Therefore ,

Option ( a ) is correct.

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