a³ + b³ = (a + b)(a² - ab + b²)
a³ - b³ = (a - b)(a² + ab + b²) (7b - 3)(49b² + 21b + 9) = (7b - 3)( (7b)² + 7b * 3 + 3²) = (7b)³ - 3³ = 343b³ - 27
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a³ + b³ = (a + b)(a² - ab + b²)
a³ - b³ = (a - b)(a² + ab + b²)
(7b - 3)(49b² + 21b + 9) = (7b - 3)( (7b)² + 7b * 3 + 3²) = (7b)³ - 3³ = 343b³ - 27