How do you factor $m² + 4mn - 5n²$ ?

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Answer 1 · 2018-04-16T14:41:37

$(m+5n)(m-n)$

$"the factors of - 5 which sum to + 4 are + 5 and - 1"$

$rArrm^2+4mn-5n^2=(m+5n)(m-n)$

How do you factor m² + 4mn - 5n²m² + 4mn - 5n²?