# calculus

What is the derivative of f(x)=e^-3x

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1. What is -3*e^-3x ? You ought to have this in your head, automatically.

f=e^ax
f'= a*e^ax
f"=a^2*e^ax

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bobpursley
2. Thats what I thought but the negative threw me off. I didn't know if I needed to subtract 1 to remove the negative. Or if that mattered in this equation.

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