(a)[1]
Complete the table for the function $y=x^3-4x^2+12$.
(b)[4]
Sketch the graph of $y=x^3-4x^2+12$ for $-2\le x\le 4$.
(c)[1]
From your graph, solve the equation $x^3-4x^2+12=0$.
(d)[4]
Use a suitable line drawn on the grid to find the roots of the equation $x^3-4x^2+x+4=0$.