Question 1206103
 (-1,0),(2,-54),(5,-252)
<pre>
On your TI-84
Press STAT
Press 1
Using the arrow keys and ENTER,
   Enter the 3 given x-coordinates in L1  
   Enter the 3 given corresponding y-coordinates in L2
Press STAT
Press the right arrow once to highlight CALC
Press 5 for QuadReg
Press the down arrow 4 times to highlight CALCULATE
Press ENTER

You'll see the values for a,b, and c on the screen

y=ax<sup>2</sup>+bx+c
a=-8
b=-10
c=-2
R<sup>2</sup>=1

The R<sup>2</sup>=1 tells us that it's a perfect fit.

Edwin</pre>