Factoring when theres 2 variables

[From: ] [author: ] [Date: 11-09-30] [Hit: ]

I need help with this question

m² - n² - 4 + 4n

m^2 - (n^2 - 4n +4) = m^2 - (n-2)^2 = (m - n + 2)(m + n - 2) using difference of squares formula.

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