Which quadratic function best fits this data?
x y 1 350 2 539 3 678 4 875 5 690 6 502
y=−56.80x2+437.91x+65.5
y=56.80x2−437.91x+65.5
y=−56.80x2+437.91x−65.5
y=−56.80x2−437.91x+65.5
