Respuesta :
Answer:
28
Step-by-step explanation:
A(x) = x * (x + 3)
   = x^2 + 3x
A(4) = 4^2 + 3(4)
    = 16 + 12
    = 28
Answer:
28
Step-by-step explanation:
A(x) = x * (x + 3)
   = x^2 + 3x
A(4) = 4^2 + 3(4)
    = 16 + 12
    = 28