((a-2)/(a+4))×((a²+8a+16)/4a²)
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((a-2)/(a+4))×((a²+8a+16)/4a²)
((a-2)/(a+4))×((a²+8a+16)/4a²)
((a-2)/(a+4))×((a²+8a+16)/4a²)
((a-2)/(a+4))×((a²+8a+16)/4a²)
=[(a-2)/(a+4)]×[(a+4)²/4a²]
=(a-2)(a+4)/4a²