1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: A to a+dx

  1. Feb 13, 2012 #1
    1. The problem statement, all variables and given/known data
    The function f changes value when x changes from a to a+dx. Find the true change and estimated change.
    f(x)=x2-x, a=3, dx=.04

    a) .2;.08 b).2016;.2016 c).2016;.2 d).2016;.08

    2. Relevant equations

    3. The attempt at a solution
    Answer = C, but idk what the first number is.

    IDK what to do with that tho lol.
  2. jcsd
  3. Feb 13, 2012 #2


    User Avatar
    Homework Helper

    The first number you get from
    f(a + dx) - f(a),
    it looks like.
  4. Feb 13, 2012 #3
    Nope I tried that, I end up getting .2416 for some reason >.<
  5. Feb 13, 2012 #4


    User Avatar
    Homework Helper

    Try again. Find
    f(3.04) - f(3).
  6. Feb 13, 2012 #5
    Lol what a fail, I was doing (3.04)2-3 not 3.04..

    Thanks, kind of embarrassing.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook