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b) (2x-5)(2x+5)
c) (6a-2)(6a+2)
d) (10z-4y)(10z+4y)
e) (9a-7b)(9a+7b)
f) (12x-8y)(12x+8y)
g) (11y-3z)(11y+3z)
h (4ab-1)(4ab+1)