Question 903185
x,y
1,17
3,30
5,47
17=1*a+1*b+c,
30=9*a+3*b+c,
47=25*a+5*b+c
solve for a,b and c

y=0.5x^2+4.5x+12
(2,23)
x=2 y=23
(4,38)
x=4 y=38
(7,68)
x=7 y=68