(a+3)(a-3)-2a(4+a)=(a²-9)-(8a+2a²)=a²-9-8a-2a²= -a²-8a-9
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(a+3)(a-3)-2a(4+a)=(a²-9)-(8a+2a²)=a²-9-8a-2a²= -a²-8a-9