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Question: remove "fsolve" residual !

Question:remove "fsolve" residual !

mehdi jafari 754 Maple
rootfinding fsolve numeric
April 23 2018
0

i have a function,when using fsolve to solve it, it has two roots. when i substitute it into the main function, it has some residual and it is not exactly 0. how should i remove the residual ? i do not want to use "solve" command and i should use "fsolve" command. tnx in advance


 

> 

restart:
> 

f:=3*(2*x-1)^2*(1/2)-1/2;

(3/2)*(2*x-1)^2-1/2

 (1)
> 

ans:=fsolve(f)

.2113248654, .7886751346

 (2)
> 

eval(f,x=ans[2])

-0.4e-9

 (3)
> 

 

> 

 

> 

 

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