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