Problem to solve exponential equation

hello. I have a problem when a try solve exp(1/x)=b equation where b is a known number. for example vpasolve(exp(1/x)==3,x) the result is -1.0787658120660760897089735826813e186744862 that's clearly wrong. please help me

Answer 1

[Walter Roberson]

You are right, I am seeing the same thing, but different results.

-2.9994493695148696857379250512264623387666217934763e178433142

I will file a bug report... filed.

[Jose Fernandez]

ok. thanks

Answer 2

[James Tursa]

Why not solve it directly:

x = 1./log(b)

What's the point of using vpasolve for this?

[Jose Fernandez]

because the equation that i want solve is exp(-(3.14*ra)/x)+exp(-(3.14*rb)/x)=1 and in this case i cant apply log to solve. but i realize a change of variable x=1/y to solve getting good results. thanks