Answer:
First one 2(x^2-4)
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Step-by-step explanation:
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4(a). 2(x^2 - 4)
(e). ab(a^2 - b^2)
5(a). (x + 2)^2
(d). (x - 4)^2
6(a). -(3x - )^2
(b). 2(x-5)(x+5)
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