Respuesta :

S1NGH

Answer:

9x² + 12

Step-by-step explanation:

Area  = Length × Width

Area = 3 × (3x² + 4)

Area = 9x² + 12

Step-by-step explanation:

Area  = Length × Width

Area = 3 × (3x² + 4)

Area = 9x² + 12

so, Answer:

9x² + 12