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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
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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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