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: Additional maths help please

  1. Sep 30, 2008 #1
    additional maths help please!!

    My minds gone blank. How do I solve this
    Find the equations of the tangents to the curve y=(2x-1)(x+1) at the points where the curve cuts the x axis. Find the point of intersection of these tangents.
  2. jcsd
  3. Sep 30, 2008 #2
    Re: additional maths help please!!

    First find the tangent equation using differentiation, then find the points where the curve cuts the x-axis and plug in.
  4. Sep 30, 2008 #3


    User Avatar
    Science Advisor

    Re: additional maths help please!!

    I would be inclined to do it the other way around! First find the x-values where the curve crosses the x-axis (y= 0 there), then find the derivative at those values of x. No real difference, of course.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook