File:Secret-Sharing-polynomial.png

Plot of ${\displaystyle 4+3x-1x^{2}}$ generated in octave with

x = -1:0.05:6
hold on
gset nokey
plot(x, 4 + 3 * x + -1 * x.^2)
plot(1, 4 + 3 * 1 - 1 * 1^2, 'b+')
plot(2, 4 + 3 * 2 - 1 * 2^2, 'b+')
plot(3, 4 + 3 * 3 - 1 * 3^2, 'b+')
plot(4, 4 + 3 * 4 - 1 * 4^2, 'b+')
plot(5, 4 + 3 * 5 - 1 * 5^2, 'b+')
plot(0, 4, 'g*')