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(2z - 7)(z + 4)
its either (z2+ 9)(z - 2) , (z2+ 2)(z - 9) , or (z2- 9)(z - 2)
There isn't a GCF you can pull out of that equation. But, you can factor it. If that's + 12z2, it becomes (2z2 - 5)(z + 6)