Which is the completely factored form of 18x4 – 42x3 + 24x2?

First factor out the greatest common factor, 6x²: 18x⁴ − 42x³ + 24x² = 6x²(3x² − 7x + 4). The quadratic factors as (3x − 4)(x − 1), since their product is 3x² − 7x + 4. Thus the completely factored form is 6x²(3x − 4)(x − 1), choice D.

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