Example 4.10. Given the centers =1. 1=3, C2-4, and C3=4.5 and the coefficients a0=5, 01=-2, a2=0.5, a3 =-0 1, and a4=0.003, find P1(), P2(a), P3(a), and PA(a) and evaluate P: (2.5) for k= 1, 2, 3, 4