[填空题]
The diagram below shom8n7f7we+9r 5rc9 g txph zw)vw9i0ewv -5y+dd qom- rss the 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 =