GCF means Greatest Common Factor



therefore we are going to factor 



-3x^4 and 6x^3 then we will be able to find the greatest common factor.





-3x^4 = -1 * 3 * x * x * x * x



 6x^3 =  2 * 3 * x * x * x         Find the common factors

__________________________

             3 * x * x * x    -------> this are the common factor



3 * x * x * x  = 3x^3 this is also considered as the GCF

             

 

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