factorize : 125x³ - 216y³
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= (5³)x³ - (6³)y³
= (5x)³ - (6y)³ → recall the previous result where: a = 5x and where: b = 6y
= (5x - 6y).[(5x)² + (5x * 6y) + (6y)²]
= (5x - 6y).(25x² + 30xy + 36y²)