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Method 1:
\Factor the each monomial.
\18wx2 = 2 · 3 · 3 · w · x · x
\45wx2 = 3 · 3 · 5 · w · x
\The GCF is the product of the common prime factors in each monomial.
\GCF = 3 · 3 · w · x
\The greatest common factor of 18wx2 and 45wx2 is 9wx.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 18wx2 and 45wx2 is 9wx.