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: Calc Question: Finding Secant Slope?

  1. Jan 23, 2005 #1
    I wrote down the notes from class, but when I tried to do the homework, I am not even close to the right answers. The formula I wrote down is:
    Apparently that's wrong. Anyone know what it's supposed to be?
  2. jcsd
  3. Jan 23, 2005 #2
    Do you mean the derivative of [tex]f(x)=\sec x[/tex]? In that case it's [tex]\sec{x}\tan{x}[/tex].
  4. Jan 24, 2005 #3
    The point [tex]\mbox(p(1,\frac{1}{2}))[/tex] lies on the curve [tex]y=\frac{x}{1+x}[/tex].
    If [tex]Q[/tex] is the point [tex](x,\frac{x}{(1+x)})[/tex], use your calculator to find the slope of the secant line [tex]PQ[/tex] for the following value of [tex]x[/tex]: 0.5

    I get -2, but it's really .33333.
  5. Jan 24, 2005 #4


    User Avatar
    Science Advisor
    Homework Helper

    The slope is simply
    [tex] a=\frac{y_{1}-y_{2}}{x_{1}-x_{2}} [/tex]

    and i get 1/3...

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook