Answer:
(2x + 1)(8x² + 3)
Explanation:
given
16x³ + 8x² + 6x + 3 ( factor the first/second and third/fourth terms )
= 8x² (2x + 1) + 3(2x + 1) ← factor out (2x + 1) from each term
= (2x + 1)(8x² + 3)
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