Given the 3 points you entered of (17,17), (12,7), and (12,24):
Calculate the quadratic equation formed by those 3 points
b = x-coordinate of 17
a = x-coordinate squared
172 = 289
c is always equal to 1
d = our y-coordinate of 17
f = x-coordinate of 12
e = x-coordinate squared
122 = 144
g is always equal to 1
h = our y-coordinate of 7
j = x-coordinate of 12
i = x-coordinate squared
122 = 144
k is always equal to 1
l = our y-coordinate of 24