- **Calculus**
(*http://mymathforum.com/calculus/*)

- - **Find the tangent line approximation**
(*http://mymathforum.com/calculus/339604-find-tangent-line-approximation.html*)

Find the tangent line approximationFind the tangent line approximation for f(x) = 1/x near x=8 so I used the f(a) +f'(a)(x-a) f = 1/x f' = -1/x^2 I end up writing y - 1/8 = -1/64 (x + 8) my answer I get is -1/64 - 1/4, but it's wrong so I am stuck. :/ Any help? |

$f(x)=\dfrac 1 x$ $f'(x) = -\dfrac{1}{x^2}$ $f(8) = \dfrac 1 8$ $f'(8) = -\dfrac{1}{64}$ $f(x) \approx \dfrac 1 8 - \dfrac {1}{64}\left(x - 8\right) = -\dfrac{1}{64}x +\dfrac 1 4$ you're trying to produce a function of $x$, not a number. |

All times are GMT -8. The time now is 05:12 PM. |

Copyright © 2019 My Math Forum. All rights reserved.