(-n+7) (-4n-7)
\((-n+7) (-4n-7)\\ =\;-n(-4n-7)\;+7(-4n-7)\\ =\;+4n^2-7n\;+\;\;-28n-49\\ =4n^2-7n-28n-49\\ =4n^2-35n-49\\\)
yer mum
