Respuesta :

Answer:

6x^2 + 8x + 28

Step-by-step explanation:

2 times the length plus 2 times the width gives the perimeter

2(3x^2 + 3x + 6) + 2(x + 8)

6x^2 + 6x + 12 + 2x + 16

6x^2 + 8x + 28

Answer:

12x²+ 28

Step-by-step explanation:

Since to find the perimeter we need to add all the side lengths together. That would give us, 12x²+ 28.