Factor 6x4 – 5x2 + 12x2 – 10 by grouping. What is the resulting expression?

Rearrange the terms into groups: (6x⁴ + 12x²) + (−5x² − 10). Factor each group to get 6x²(x² + 2) − 5(x² + 2). The common factor is (x² + 2), leaving (6x² − 5)(x² + 2), choice D.

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