I'm learning about derivatives and on the website they put the value(adsbygoogle = window.adsbygoogle || []).push({});

x^2 into f(x + dx) and it became

(x + dx)^2

Shouldn't it be (x^2 + dx^2) ?

It's the last example

https://www.mathsisfun.com/calculus/derivatives-dy-dx.html

Thanks in advance!

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# B Substitution error?

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