Answer:
Step-by-step explanation:
We are given the multiplication of two parenthesis. To find the product we can use the concept of FOIL
so
[tex](-a+3)(a+4) = -a*a-a*4+3*a+3*4[/tex]
[tex]=-a^{2} -4a+3a+12[/tex]
combine the like terms to get this
[tex]=-a^2-a+12[/tex]
so the third option is the correct one.
