Question 81335
If you're supposed to factor:
16a^2-16b^2-64bc-64c^2
16(a^2-b^2-4bc-4c^2)
16(a^2-(b^2+4bc+4c^2))
16(a^2-(b+2c)^2)
16(a-(b+2c))(a+(b+2c))
16(a-b-2c)(a+b+2c)
:

2c^16-2d^16
2(c^16-d^16)
2(c^4+d^4)(c^4-d^4)
2(c^4+d^4)(c^2+d^2)(c^2-d^2)
2(c^4+d^4)(c^2+d^2)(c+d)(c-d)
Happy Calculating!!!!