(adsbygoogle = window.adsbygoogle || []).push({}); Notation of derivative?? help

Where does dy/dx come from I know what it means but is this right

y=x^2+2x

dy=2x*dx+2*dx

dy/dx=(2x*dx+2*dx)/dx

dy/dx=2x+2

Im not sure if this is right can someone please explian thanks

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# Notation of derivative? help

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