(a)[2]
Express $x^2+4x-12$ in the form $(x+a)^2+b$.
(b)[1]
Use your result from part (a) to determine the coordinates of the turning point of the graph of $y=x^2+4x-12$.
(c)[4]
Sketch the graph of $y=x^2+4x-12$ and show the values where the graph meets the axes.