Question

помогите пожалуйста номер 720

Answer 1

$1) (m^2-2m)^2-1=(m^2-2m-1)(m^2-2m+1)= \\ = (m^2-2m-1)(m-1)^2\\ 2) 16-(m^2+4m)^2=(4-m^2-4m)(4+m^2+4m) =\\=(4-m^2-4m)(m+2)^2\\ 3) x^2-18xy+81y^2-z^2=(x-9y)^2-z^2=(x-9y-z)(x-9y+z) \\ 4) 64x^2+48xy+9y^2-144=(8x+3y)^2-12^2 = \\ = (8x+3y-12)(8x+3y+12)\\ 5) c^2-a^2+22a-121=c^2-(a-11)^2=(c-a+11)(c+a-11)\\ 6) 100-25y^2-60x^2y-36x^4=10^2-(5y+6x^2)^2=\\=(10-5y-6x^2)(10+5y+6x^2)$[