Dear Ali,
Here is a note to solve the homework of Polynomial curve fitting:
1. Copy the sample points of the exponential function and use them as reference points where you want to fit your polynomial P(x).
2. Use a polynomial of order 3 (Because you have 4 points from the sample of the exponential function).
3. Use the same method as the example on page 4 of the handout and calculate a0, a1, a2, a3.
4. Then compare the result of the polynomial function that you have just calculated with the exponential function when you enter X = 1.15.
Good luck!