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Answer:
(7x² + 5) ( x + 3)
Step-by-step explanation:
7x²(x + 3) + 5(x+3)
Factor out x + 3
(7x² + 5) ( x + 3)
7x³ + 21x² + 5x + 15
Factorize
7x²(x + 3) + 5(x + 3)
(7x² + 5) ( x + 3)