Question 948208
A parabola whose axis is parallel to the y-axis passes through the points (1,1), (2,2) and (-1,5). Find its equation.
--------------------
Form:: 
ax^2 + bx + c = y
-----
Using (1,1) u get:: a + b + c = 1
Using (2,2) u get: 4a + 2b + c = 2
Using (-1,5) u get: a - b + c = 5
----------------
Using a Matrix Program I get::
a = 1
b = -2
c = 2
------------
Equation:
y = x^2 - 2x + 2
=====================
Cheers,
Stan H.
--------------