Answer:
(y - 9)(y² + 9y + 81)
Explanation:
a difference of cubes is factored in general as
a³ - b³ = (a - b)(a² + ab + b² )
given
y³ - 729
= y³ - 9³ ( with a = y and b = 9 )
= (y - 9)(y² + 9y + 9²)
= (y - 9)(y² + 9y + 81) ← in factored form
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