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How do you find the greatest common factor of 9, 21?

Answer 1

Mila Anderson

#GCF(9,21)=3#

factors 9:--#{1,3,9}#

factors 21:--#{1,3,7,21}#

common factors:---#{1,3,9}nn{1,3,7,21}#

#={1,3}#

#GCF(9,21)=3#

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Answer 2

Benjamin Altschul

To find the greatest common factor (GCF) of 9 and 21, list the factors of each number and identify the largest factor they have in common.

Factors of 9: 1, 3, 9 Factors of 21: 1, 3, 7, 21

The greatest common factor of 9 and 21 is 3.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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