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To simplify (2z - 3)2, you need to square each term inside the parentheses:
(2z - 3)2 = (2z - 3)(2z - 3)
= 2z(2z) - 3(2z) - 3(2z) + 3(3)
= 4z^2 - 6z - 6z + 9
= 4z^2 - 12z + 9
Therefore, the simplified expression is 4z^2 - 12z + 9.