Answer:
9m²n⁴
Explanation:
9m²n⁴ = 3² × m² × n⁴
72m⁸n⁴ = 2³ × 3² × m⁸ × n⁴
GCF = multiplication of all common factors amongst the 2 expression with the lowest power(yes it's the lowest power)
GCF = 3²m²n⁴ = 9m²n⁴
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