0
z2 - 4
first set up your parenthesis for factoring
( )( )
now put in your "z" in both first places in the parenthesis because this is obviously the only place it can go
(z )(z )
now find what can multiply to 4 and add or subtract to equal 0... the answer is -2 and 2 so put both these numbers in the remaining spots
(z - 2)(z + 2)
this is now in factored form
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