quad data

• Table of $x_i$ and $y_i$ values with $i = 1, 2, .., 7$.

  $i$	1	2	3	4	5	6	7
  $x$	2	3	4	5	6	7	8
  $y$	5	0	-3	-4	-3	0	5

• The relation is $y_i = f(x_i)$, where $f(x) is a qua-dratic function.