Respuesta :
1. Regroup terms.
(3-a)(a+4)
2. Use the FOIL method: (a+b)(c+d) = ac+ad+bc+bd.
3a+12-a^2-4a
3. Collect like terms.
(3a-4a)+12-a^2
4. Simplify.
-a+12-a^2
hopefully this helps!
(3-a)(a+4)
2. Use the FOIL method: (a+b)(c+d) = ac+ad+bc+bd.
3a+12-a^2-4a
3. Collect like terms.
(3a-4a)+12-a^2
4. Simplify.
-a+12-a^2
hopefully this helps!