The product of the two numbers to be found is 147 and the sum of the two numbers should be a minimum. Let the first number be X, the second number is 147/X
The sum of the numbers is S = X + 147/X
To minimize S, S' = 0 has to be solved.
=> 1 - 147/X^2 = 0
=> 147 = X^2
=> X = `sqrt(147)`
The product of the the two numbers is 147 and their sum is a minimum when the numbers are both equal to `sqrt 147`