How to get values that make funtion max

I m quite new using Matlab, my question is as follows.

Let say a*b = 50, how can I get the values of a and b? a and b are a list of values. Thanks.

[Fangjun Jiang]

Don't post duplicated questions. If you didn't get an answer, chances are that your question is not clear, like this one.

Answer 1

[Andrei Bobrov]

a1 = rand(1,10)
b = rand(10,1)
a = a1/(a1*b)*50
ablst = [a' b]
a*b

Answer 2

[Walter Roberson]

There are somewhere on the order of 2^62 different (a,b) pairs that satisfy this function, I estimate.