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A cost estimator at a logistics company is simplifying a packaging material cost model represented by the expression 4x2+8bx−4ax−8ab{}4x^2 + 8bx - 4ax - 8ab. To begin factoring this expression, the estimator must first identify and extract the greatest common factor (GCF) of all four terms. The numerical greatest common factor of this expression is ____.

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Updated 2026-09-19

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