1) (a-12)^3 - 125 = (a-12-5)(a-12)^2 + 5(a-12) + 5^2 - 125 = (a-17)(a^2-24a+144) + 5a - 60 + 25 - 125 = (a-17)(a^2-24a+144) + 5a - 160
2) (b+4)^3+64 = (b+4+4)(b+4)^2 - 4(b+4) + 16 = (b+8)(b^2+8b+16) - 4b - 16 + 16 = (b+8)(b^2+8b+16) - 4b
3) 81 - (c^2+6c)^2 = 81 - (c^2+6c)(c^2+6c) = (9-c)(9+c)(9+c)(9-c) = (9-c)^2(9+c)^2
4) 16m^2 - (m-n)^2 = 16m^2 - (m^2 - 2mn + n^2) = 16m^2 - m^2 + 2mn - n^2 = 15m^2 + 2mn - n^2
1) (a-12)^3 - 125 = (a-12-5)(a-12)^2 + 5(a-12) + 5^2 - 125 = (a-17)(a^2-24a+144) + 5a - 60 + 25 - 125 = (a-17)(a^2-24a+144) + 5a - 160
2) (b+4)^3+64 = (b+4+4)(b+4)^2 - 4(b+4) + 16 = (b+8)(b^2+8b+16) - 4b - 16 + 16 = (b+8)(b^2+8b+16) - 4b
3) 81 - (c^2+6c)^2 = 81 - (c^2+6c)(c^2+6c) = (9-c)(9+c)(9+c)(9-c) = (9-c)^2(9+c)^2
4) 16m^2 - (m-n)^2 = 16m^2 - (m^2 - 2mn + n^2) = 16m^2 - m^2 + 2mn - n^2 = 15m^2 + 2mn - n^2