Question

factorise expressions 25 m square 40 mn -16n square​

Answer 1

Answer:

$(5m - 4n)(5m - 4n)$

Step-by-step explanation:

${25m}^{2} - 40mn - {16n}^{2} \\ {25m}^{2} - (20 + 20)mn - {16n}^{2} \\ {25m}^{2} - 20mn - 20mn - {16n}^{2} \\ 5m(5m - 4n) - 4n(5m + 4n) \\ (5m - 4n)(5m + 4n)$

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