Find fractional exp. root

How can I find root of this ? . 1/s + 1/s+3 + 1/s+10 = 0

Answer 1

[the cyclist]

I assume your equation is

1/s + 1/(s+3) + 1/(s+10) = 0

There are a couple different ways:

% With the Symbolic Math Toolbox
syms s
solve(1/s + 1/(s+3) + 1/(s+10))

ans = 

% Numerically in base MATLAB. (Required multiplying through by the
% denominator terms, to get the coefficients.)
roots([3 26 30])

ans = 2x1

-7.2961 -1.3706

Also, you didn't really MATLAB here. Just the quadratic formula.