Answer:
[tex]\large\boxed{-3x^2+13x-4}[/tex]
Step-by-step explanation:
Use FOIL:
(a + b)(c + d) = ac + ad + bc + bd
[tex](3x-1)(-x+4)=(3x)(-x)+(3x)(4)+(-1)(-x)+(-1)(4)\\\\=-3x^2+12x+x-4\\\\\text{combine like terms}\\\\=-3x^2+(12x+x)-4=-3x^2+13x-4[/tex]
