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!

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Using limits to find tangents

**Physics Forums | Science Articles, Homework Help, Discussion**