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: How many ways are there to solve this question?

  1. Feb 25, 2012 #1
    1. The problem statement, all variables and given/known data

    vector a = (0,1,0)
    vector b = (-2,1,1)
    vector c = (1, a-2, a+2)

    for what value of a are the three vectors coplanar?

    2. Relevant equations

    don't know how to do this

    3. The attempt at a solution

    didn't try anything
  2. jcsd
  3. Feb 25, 2012 #2
    If a is a parameter, you shouldn't name the vector a as well.

    Have you read the definition coplanar?
  4. Feb 25, 2012 #3
    Well let's start at the fundamental level.

    Do you know what coplanar means?
  5. Feb 25, 2012 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    After looking at the title of this thread ... I can think of two ways.
  6. Feb 26, 2012 #5
    What are those two ways?
  7. Feb 26, 2012 #6


    Staff: Mentor

    Locking the thread, because the OP has not shown any effort at solving this problem.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook