i have absoloutly no clue how todo these two factoring questions.?

Question

jeez i hate factoring! i am going to stay after at lunch tomorrow and get help from my math teacher :P but these two questions are on my math homework and i really need help. if you could tell me what you need to pull out of the two and kinda walk me through one of them i might be able to understand better.


here they are.

z3-z (the 3 is an exponent)
x4-1 (the 4 is an exponent)

Answer 1

z3-z, you can take a z out.
z(z2-1)

x4-1, this is a difference of squares
(x2-1)(x2+1)

Factoring can be fun as long as you understand it.