Need help please.........................

Answer:
16[tex]t^{2}[/tex] + 2t - 6
Step-by-step explanation:
[tex](12t^{2} + 5t -y) - (-4t^{2} + 3t -1)[/tex]
simplify
[tex]12t^{2} + 5t -7 +4t^{2} -3t +1[/tex]
combine like terms
16[tex]t^{2}[/tex] + 2t - 6