Answer:
Perimeter is 9x² + 15x + 36
Step-by-step explanation:
[tex]{ \tt{perimeter = s \times s \times s}} \\ { \tt{p = 3s}}[/tex]
- p is the perimeter
- s is side
[tex]{ \tt{p = 3(3 {x}^{2} + 5x + 12) }} \\ { \boxed{ \tt{ \blue{p = 9 {x}^{2} + 15x + 36 \: }}}}[/tex]
