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The expression -3m - [2m + (5 - m)] + 7 was simplified as 2 - 4m. Without simplifying, explain how...
4 months ago
Q:
The expression -3m - [2m + (5 - m)] + 7 was simplified as 2 - 4m. Without simplifying, explain how you can show that it has been simplified correctly.
Accepted Solution
A:
(3n - 2m)^2 \\ \\ (3n)^2 - 2 \times 3n \times 2m + (2m)^2 \\ \\ 3^2n^2 - 2 \times 3n \times 2m + (2m)^2 \\ \\ 9n^2 - 2 \times 3n \times 2m + (2m)^2 \\ \\ 9n^2 - 2 \times 3n \times 2m + 2^2m^2 \\ \\ 9n^2 - 2 \times 3n \times 2m + 4m^2 \\ \\ 9n^2 - 12mn + 4m^2The final result would be, 9n² - 12mn + 4m².