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## Homework Statement

Hi, this is more of a review question and I'm just looking at solutions of natural cubic spline equations and some will give the cubic spline as:

1. s(x) = a + bx + cx^2 + dx^3

on Wolfram

while other pages will give:

2. s(x) = a + b(x - t) + c(x-t)^2 + d(x-t)^3

where t is the first coordinate in the each point given. I'm not sure which is the standard version and it can make a difference when I evaluate the derivatives so any clarification is appreciated.