Mathematica: Extract numerical value when using Solve

Question

In Mathematica, calling Solve, returns a list of rules, e.g.,

In[1]:= g = Solve[(x - 1) (x - 2) == 0, x]
Out[1]= {{x -> 1}, {x -> 2}}

How can I extract the numerical values 1 or 2 from g?

I tried using Part e.g., g[[1]] but it returns {x -> 1} and not 1.

Please advise.

Answer 1

To complement Belisarius' answer,

x /. g

with g = {{x -> 1}, {x -> 2}}, returns the list

{1, 2}

So to extract the first value, 1, we could use

First[x /. g]

Other alternatives are

x /. g[[1]]
(x /. g)[[1]]    (* this is equivalent to the version using First *)
g[[1,1,2]]

Answer 2

x /. g[[1]]

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