Answer: A plateau period is when you are in a place where nothing hasn’t moved concerning a situation.
Explanation: For example, someone can have a plateau in weight, where the scale isn’t moving up or down it’s just staying the same.
The simplified expression is 
Explanation:
The expression that we have in this problem is

We want to simplify this expression: in order to do so, we apply the rule to solve the square of a binomial:

Where in our expression, we have:

So, the various terms are:

Therefore, the final expression becomes

Learn more about simplify expressions:
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Because Thailand is mostly made up of mountainous terrain and many forests.