The answer is a² + 6. "Sum of a squared and 6" means you square a value and then add 6 to it.
 
        
             
        
        
        
Answer:
i dont no but what i got was 10x+144d^3 but do u want to sovle for x i got u X
Step-by-step explanation:
 
        
             
        
        
        
Divide the perimeter by 3 to get 8 then use the equation for the area of a triangle (a= BH1/2) and your answer is 32