Write a quadratic function in standard form for the parabola that passes trough the points (-2,23)(0,9) and (6,-57) using quadratic regression

Answer 1

I will get you as far as a pair of simultaneous linear equations; you go from there.

The equation is y = Ax² + Bx + C

Since the parabola goes through (0,9), C=9

-8A + 4B = -7

36A + 6b = -66