Combine the like terms
-x-x^2+7
Answer:
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Step-by-step explanation:
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If an expression is the difference of two squares, it will follow this format:

where a and b are integers or variables.
1)

Since the expression follows the format, it's a DoTS.
2) Since the binomial has an addition sign, it isn't a DoTS.
3)

The second term isn't an integer, so the expression isn't a DoTS.
4)

Since the expression follows the format, it's a DoTS.
Therefore, the first and fourth expressions are differences of two squares.
Put your dot 5 marks left of zero
Put the other dot 10 marks right of zero