[填空题]
The diagram below sho9jycqb gd 124yws the..ihw :,s tpz0fct*zs graph of a quadratic function f(x)=$2x^2$+bx+c.
1.Write down the value of c. c =
2.Find the value of b and write down f(x). f(x) =$ax^b+cx+d$ a = b = c = d =
4.Calculate the coordinates of the vertex of the graph of f. f (-1) = (a,b) a = b =