Answer :
The expression for the statement that is given is (m² + n²) - 2mn
The expression given is that twice the product of m and n is decreased by the square of the sum of m and n. This will be written as:
= [2 × (m × n)] - (m + n)²
= 2mn - (m² + n²)
= (m² + n²) - 2mn
In conclusion, the correct option is D.
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