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Method 1:
\Factor the each monomial.
\9a = 3 · 3 · a
\10a3 = 2 · 5 · a · a · a
\The GCF is the product of the common prime factors in each monomial.
\GCF = a
\The greatest common factor of 9a and 10a3 is a.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 9a and 10a3 is a.
\