[tex]3 + 4p^2 - 5p - 3p^2 + 4p - 8[/tex]
Order the terms
[tex]3 + 4p^2 - 5p - 3p^2 + 4p - 8[/tex]
[tex]4p^2 - 3p^2 - 5p + 4p - 8 +3[/tex]
Combine like terms
[tex]4p^2 - 3p^2 - 5p + 4p - 8 +3[/tex]
[tex]p^2 - 5p + 4p - 8 +3[/tex]
[tex]p^2 - p - 8 +3[/tex]
[tex]p^2 - p - 5[/tex]
Answer = [tex]p^2 - p - 5[/tex]