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HELP

// ---- f blue, g green, h red, k orange ----
function f(x) { with(Math) { y = log(x/(3-x))}; return y }
function g(x) { with(Math) { y = log(x*x-x-2)}; return y }
function h(x) { y = x/(3-x); return y }
function k(x) { y = x*x-x-2; return y }
...
aX = -4; bX = 5; aY = -4; bY = 4
Dx = 1; Dy = 1
...
Q3x = [-1,2]; Q3y = [0,0]; Q2x = [0]; Q2y = [0]
xx=[-1,1,2]
...
AX=BX=AY=BY=""
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AAX=aX; BBX=bX; AAY=aY; BBY=bY
...