The quadratic 3x^2-24x+72 can be written in the form a(x+b)^2+c, where a, b, and c are constants. What is a+b+c?
+37163 3x^2-24x+72
3 ( x^2 - 8x ) + 72 complete the square for x
3 ( x-4)^2 - 48 + 72
3 ( x-4)^2 + 24 You can finish from here ! 
