Which shows one way to determine the factors of 4 x cubed plus x squared minus 8 x minus 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 matches choice A. The shared binomial is (4x + 1).

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