Given:
The three points are (-7,134), (-3,10) and (5,50).
To find:
The equation of parabola using quadratic regression.
Solution:
The general equation of quadratic regression is
...(i)
The three points are (-7,134), (-3,10) and (5,50).
Using the graphing calculator, we get a=3, b=-1 and c=-20. Putting these values in (i), we get
![y=3x^2+(-1)x+(-2)](https://tex.z-dn.net/?f=y%3D3x%5E2%2B%28-1%29x%2B%28-2%29)
![y=3x^2-x-2](https://tex.z-dn.net/?f=y%3D3x%5E2-x-2)
Therefore, the equation of parabola is
and the missing values in the given equation are 3, -1 and -20.