Answer
4$k^{2}m^{3}$(1 + 2$k^{2}$ - 3m)
Work Step by Step
1. The GCF of 4$k^{2}m^{3}$, 8$k^{4}m^{3}$, and -12$k^{2}m^{4}$ is 4$k^{2}m^{3}$
2. Factor out the GCF.
4$k^{2}m^{3}$(1 + 2$k^{2}$ - 3m)
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