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a2) (x-4)(x+4)
b1) 2(x-2)(x+2)
b2) (x+3)(x-2)
c1) (2x-5)(2x+3)
c2) (2x+3)(x-1)
a. = (x + 4)(x + 2)
(x - 4)(x+4)
= x + 2
x - 4
b. = (2x + 4)(x - 2)
( x + 3 )(x - 2)
= 2x + 4
x + 3
c. = (2x +3)(2x - 5)
(2x + 3)( x - 1)
= 2x - 5
x - 1