Question

(m+4)^2-4 (m+1)^2??????!!!!!

Answer 1

m^2+8m+16-4m^2+8m+4=16m-3m^2+20

Answer 2

$(m+4)^2-4 (m+1)^2 = \\ = (m + 4 - 2(m + 1))(m + 4 + 2(m + 1)) = \\ = (m + 4 - 2m - 2) (m + 4 + 2m + 2) = \\ = (2 - m)(3m + 6) = 3(2 - m)(m + 2)$