my daughter has the same calculator and she got
y=0x^2+1x-5
try going from main menu into STAT and then putting in x into list 1 (1,2,3,4) and then y into list 2 (5,14,27,44) and then pressing F2 which is CALC and then pressing F3 which is REG and then F3 which is X^2 and it will give you what a,b,c are for y=ax^2+bx+c
see how you go with this. Thats how she would do it. She is not sure if it is right though.