The point at which the curve crosses the 'y' axis is the value of c. This being -2.
by using the complete the square form, we can work out the rest of the equation.
To do this, we use the vertex, or lowest point of the graph.
this gives us x^2+2x+1-3 or x^2+2x-2
Thus. The values are ....
I cannot recall an answer to part b. But I hope this has helped