Which shows one way to determine the factors of x cubed plus 4 x squared plus 5 x plus 20 by grouping?

Group the polynomial as (x³ + 4x²) + (5x + 20). Factoring each group gives x²(x + 4) + 5(x + 4), which matches the choice with x² times (x + 4) plus 5 times (x + 4). The repeated binomial can then be factored out to get (x + 4)(x² + 5).

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