Question

factorise : 25-m² - n²-2mn​

Answer 1

Answer:

$25 - {m}^{2} - {n}^{2} - 2mn \\ 25 - ( {m}^{2} + 2mn + {n}^{2} ) \\ {5}^{2} - ( {m + n)}^{2} \\ \{5 - (m + n) \} \{5 + (m + n) \} \\ (5 - m - n)(5 + m + n)$