4. The following incomplete y vs. x data is given
x |
1 |
2 |
4 |
6 |
7 |
y |
5 |
11 |
???? |
???? |
32 |
The data is fit by quadratic spline interpolants given by
-
-
- f(x)=ax−1,1≤x≤2
- f(x)=−2x2+14x−9,2≤x≤4
- f(x)=bx2+cx+d,4≤x≤6
- f(x)=ex2−fx+g,6≤x≤7
where a,b,c,d,e,f, and g, are constants. The value of dxdf at x=2.6 is most nearly