hi,

i am given four points like (2,0.5),(3,0.3333),(4,.25),(5,02)

how can i get the cubic polynomial from the given points..

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- Apr 14th 2009, 05:53 PMvineelahow to find cubic polynomial from 4 given points
hi,

i am given four points like (2,0.5),(3,0.3333),(4,.25),(5,02)

how can i get the cubic polynomial from the given points.. - Apr 14th 2009, 06:03 PMnzmathman
A cubic polynomial has the form $\displaystyle y = ax^3 + bx^2+cx+d$

Now plug all your values into this equation and you will end up with a system of 4 linear equations which can be solved to find the values of a, b, c and d. A good calculator can do this or I'm sure if you looked up 'simultaneous equations solver' or the like online you can find the solutions. - Apr 15th 2009, 03:22 AMShowcase_22
Can't you also use a matrix and elementary column operations to get the values of a,b,c and d?