Which shows one way to determine the factors of x cubed minus 9 x squared plus 5 x minus 45 by grouping?

Regroup the terms as x³ + 5x − 9x² − 45. Factoring x from the first two terms and −9 from the last two gives x(x² + 5) − 9(x² + 5), which matches choice C. Both groups have the common factor (x² + 5), so this grouping can be factored further.

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