Question 629298
<pre>
On your TI-84
press STAT 
press ENTER
Under L1 enter the x-coordinates and under L2 enter the y-coordinates.
That is, make the screen look like this under L1 and L2
L1 | L2
-1 |  5  
 0 |  5
 2 | 29

Press STAT then right arrow once to highlight CALC
Press 5 to choose this-->     5: QuadReg
Press ENTER five times
You read

y=ax<sup>2</sup>+bx+c
a=4
b=4
c=5

The answer is  f(x) = 4x<sup>2</sup> + 4x + 5

Edwin</pre>