clear
defaults
generate x -5,,5 50
y=x^2+3*x-2
SET AREAFILLCOLOR red
L = LEN(X)
X[2:L+1] = X[1:L]
X[L+2] = X[L+1]
Y[2:L+1] = Y[1:L]
Y[1] = 0
Y[L+2] = 0
GRAPH X Y
ZEROLINES\HORIZONTAL ! draw horizontal line thru (0,0)
