Question

factorisex^3-27 plzz help me to find out this problem

Answer 1

Hi ,

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We know the algebraic identity ,

a³ - b³ = ( a - b )( a² + ab + b² )

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Now ,

x³ - 27

= x³ - 3³

= ( x - 3 )( x² + x × 3 + 3² )

= ( x - 3 ) ( x² + 3x + 9 )

I hope this helps you.

: )