Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

Group the first two terms and the last two terms: (4x³ + x²) + (−8x − 2). Factoring each group gives x²(4x + 1) − 2(4x + 1), which is choice A because both groups have the common factor (4x + 1).

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