Question

(Simplify): (4m + 5n)? + (5m - 4n)?​

Answer 1

Answer:

20m²-16m²+25mn-20n²

4m²+25mn-20n²

Answer 2

Answer:

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Step-by-step explanation:

(4m + 5n) + (5m - 4n)

4m + 5n + 5m - 4n

(4m +5m) + ( 5n - 4n)

9m + n