Answer:
(5 + 2y)(25 - 10y + 4y²)
Explanation:
given
125 + 8y³ ← is a sum of cubes and factors in general as
a³ + b³
= (a + b)(a² - ab + b² )
then
125 + 8y³
= 5³ + (2y)³ ← with a = 5 and b = 2y
= (5 + 2y)(5² - 5(2y) + (2y)² )
= (5 + 2y)(25 - 10y + 4y² ) ← in factored form