Answer:
[tex]4m(m {}^{2} + 3xm {}^{2} - 2m - 6)[/tex]
Step-by-step explanation:
[tex]1. \: gcf = 4m \\ 2. \: 4m( \frac{4m {}^{3} }{4m} + \frac{12xm {}^{3} }{4m} + \frac{ - 8m {}^{2} }{4m} + \frac{ - 24m}{4m} ) \\ 3. \: 4m(m {}^{2} + 3xm {}^{2} - 2m - 6)[/tex]