-9x^3-72x^2+36=3x^3+x^2-3x+8                     Add 9x^3 to both sides.
-72x^2 + 36 = 3x^3 + 9x^3 + x^2 - 3x + 8       Add 72x^2 to both sides
36 = 12x^3 +   73x^2 - 3x + 8                           Subtract 36 from both sides.
0 = 12x^3 + 73x^2 - 3x - 28       
It does factor, but it is not very nice.
(x + 6.06)(x - 6.09)(x + 0.632) 
If there is any kind of error please report it in a note below. 
 
        
             
        
        
        
Answer:
$1,050*125x=P(x). I just need more characters.
 
        
             
        
        
        
The answer would be 78. C