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Suppose the polynomial $f(x)$ is of degree $3$ and satisfies $f(3)=2$, $f(4)=4$, $f(5)=-3$, and $f(6)=8$. Determine the value of $f(0)$.

michaelcai  Jan 23, 2018
 #1
avatar+89998 
+1

We have the following system of equations

 

27a  + 9b  +  3c  + d   =   2

64a  +16b  +  4c  + d  =   4

125a  + 25b  + 5c + d  = -3

216a  + 36b  +  6c  + d  = 8

 

Soving this isn't difficult, but it is tedious

Using  a CAS we have that

 

a = 9/2, b = -117/2, c = 245, d = -328 

 

f (0)  =  d   =   -328

 

 

cool cool cool

CPhill  Jan 24, 2018

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