x = linspace(-10,10,1000);

xdot = x.^3 - 7*x.^2 + 7*x + 15;

eq_points = [-1;3;5];

plot(x,xdot);

x = [-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10]

xdot = [-1755 -1344 -1001 -720 -495 -320 -189 -96 -35 0 15 16 9 0 -5 0 21 64 135 240 385]

eq_points = [ -1 5 3]

plot(x,xdot)

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