Выражения: a)(5a^2-2b)^2+20a^2b; б)x^4 - 121-(x^4+11)^2; в) 16m(m-1) -(4m - 1)^2 8

A) (5a^2 - 2b)^2 + 20a^2b = 25a^4 - 20a^2b + 4b^2 + 20a^2b = 25a^4 + 4b^2 
б) x^4 - 121 - (x^4+11)^2 = x^4 - 121 - x^8 - 22x^4 - 121 = -x^8 - 21x^4 - 242 = x^8+21x^4+242
в) 16m(m-1) - (4m-1)^2 = 16m^2 - 16m - (16m^2-8m+1) = 16m^2 - 16m - 16m^2 + 8m - 1 = -8m - 1 = 8m + 1