I've been using the formula(adsbygoogle = window.adsbygoogle || []).push({});

lim

x-->a f(x)-f(a)

--------

x-a

I haven't had any problems until I was asked to find the slope of the tangent at the general point whose x-coordinate is a. How do I do it with an a instead of a point?

I'm trying to find it for x^2+x+1

Thanks!

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# Using limits to find tangents

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