Answer:
[tex] = 6 {t}^{4} - 6 {t}^{3} + 3t + 1[/tex]
Step-by-step explanation:
[tex]6 {t}^{4} - t + 1 - 6 {t}^{3} + 4t \\ = 6 {t}^{4} - 6 {t}^{3} + 3t + 1[/tex]
