When i tried to find the degree of this, i also get 3, so this problem is probably the cubic function. But it is wrong, because i did see the answer in my teacher book. They state that it is degree of 2, and it is a quadratic function. So, I am confusing!
And when i assume that it is a quadratic function, i substitute 3 points into its quadratic function in general form Ax^2 + Bx + c, then i solve for A, B, and C. I got the function that represent this problem. I did substitute the remanent points into it, they are acceptable !
When we have a table of value and we are supposed to find the equation to represent it, we need to know the form of it, whether a quadratic or a cubic functions ! But i don't know how to know its form ?