Answer:
(5r + 6)(5r² + 4)
Explanation:
Given
25r³ + 30r² + 20r + 24 ( factor the first/second and third/fourth terms )
= 5r²(5r + 6) + 4(5r + 6) ← factor out (5r + 6) from each term
= (5r + 6)(5r² + 4)
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