Answer :

Answer: 3x^3 or x^2+5x+7

Step-by-step explanation:

3x^6+15x^4+21x^3=

3(x^6+5x^4+7x^3)=

3x^3(x^2+5x+7)

GCF is 3x^3 or x^2+5x+7 depending one what value x is.

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Rewritten by : Barada