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.
y=(x+1)^2-3
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