factories: 125x^3-343y^3
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a³ - b³ = (a – b) (a² + ab + b² )
.
125x³ -343y³
Put them into a³ - b³:
= (5x)³ - (7y)³
apply a³ - b³ = (a – b) (a² + ab + b² ):
= (5x - 7y) ( 25x² + 35xy + 49y²)
.
Answer: (5x - 7y) ( 25x² + 35xy + 49y²)
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