factorise 8 x cube + 343
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8x³ + 343
(2x)³ + (7)³
We kow that , (a)³ + (b)³ = ( a + b ) ( a² + b² - ab )
( 2x + 7 ) { (2x)² + 7² - 2x*7 }
( 2x + 7 ) ( 4x² + 49 - 14x )
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