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I have this equation: $y=Cxe^{-2x}$

I worked out the first derivative and checked with wolfram alpha to get: $y=Ce^{-2x}+-2Cxe^{-2x}$

But when I try and get the first derivative in my calculator, I get: $-2Cxe^{-2x}$ without the first term.

Why is this the case?

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1 Answer

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That is the result you get if you write $Cxe^{-2x}$ and forget to enter $\times$ (times) between the $x$ and the $e^{-2x}$. It treats the first $x$ as a constant.

p.s. I verified this with my own N-Spire.

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