What is the derivative of F (x) = a (X & # 178; - x-1) / e ^ x?

What is the derivative of F (x) = a (X & # 178; - x-1) / e ^ x?

Domain all real numbers
f'(x)=a(x²-x-1)'/(e^x)²
=a(2x-1)/e^2x
=2ax-a/e^2x
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