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Answer:
3x + 25 is not a factor
Explanation:
3x³ - 75x ← factor out common factor of 3x from each term
= 3x(x² - 25) ← x² - 25 is a difference of squares
= 3x(x - 5)(x + 5) ← in factored form
thus 3x + 25 is not a factor of the polynomial
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