SOLUTION: among all pairs of numbers whose sum is -18, find the pair of numbers whose product is as large as possible.( this is the part I don't understand) Evaluate algebraic methods for so

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Question 807011: among all pairs of numbers whose sum is -18, find the pair of numbers whose product is as large as possible.( this is the part I don't understand) Evaluate algebraic methods for solving the problem.
Answer by oscargut(2103) About Me  (Show Source):
You can put this solution on YOUR website!
let the pair of numbers: x and y
then we know x+y = -18
any you need to maximize : xy
If you need more help with this kind if questions, you can contact me now at:
mthman@gmail.com
Thanks