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: Functions and roots problem

  1. Apr 29, 2010 #1
    1. The problem statement, all variables and given/known data
    F(X)=√x
    F((F(2)-2)^2)+f(2)
    2. Relevant equations



    3. The attempt at a solution I get to √(-4√2 +8) ... that minus sign is annoying me =] any help?
     
  2. jcsd
  3. Apr 29, 2010 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi Patrickas! :smile:

    (try using the X2 tag just above the Reply box :wink:)
    (do you mean F((F(2)-2)2) + F(2) ?)

    Hint: F(a2) = … ? :smile:
     
  4. Apr 29, 2010 #3
    Hmmm i'm guessing that the signs will change. Then i should get -√2+2+√2= 2
    Right?
     
  5. Apr 29, 2010 #4

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Yup! :biggrin:
     
  6. Apr 29, 2010 #5
    Cool! Thanks! I wonder hoe long will i remember this rule =]
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook