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Factor the each monomial.
\3x2 = 3 · x · x
\15x3 = 3 · 5 · x · x · x
\The GCF is the product of the common prime factors in each monomial.
\The common prime factors are 3, x, and x.
\The GCF is 3 · x · x = 3x2
\The greatest common factor of 3x2 and 15x3 is 3x2.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 3x2 and 15x3 is 3x2.