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!

I want check my answer ()()()

  1. Oct 11, 2009 #1
    I want check my answer ()()()

    Attached Files:

  2. jcsd
  3. Oct 11, 2009 #2


    User Avatar
    Staff Emeritus
    Science Advisor

    For 59 you have "- x3" when you should be subtracting the square.

    For 60 you have "[itex]\sqrt{x}+ \sqrt{x}+ \sqrt{x}[/itex]" for "add three times the square root". That will work but should be written more simply as "[itex]3\sqrt{x}[/itex]".

    The others are correct.
  4. Oct 11, 2009 #3
    my dear

    #59 what is wrong ?

    # 60
    F(x) = -8xccube + 3square root of 3

    now is ok?
  5. Oct 11, 2009 #4


    Staff: Mentor

    #59 "subtracts the square of the domain element", not the cube of it, as you have.
    #60 Correct. F(x) = -8x3 + 3[itex]\sqrt{3}[/itex]
  6. Oct 11, 2009 #5


    User Avatar
    Homework Helper

    In #59 the question says "...then subtract the square of the domain element..." (maybe the underline is the key here :wink:)
    But you have subtracted the cube.
    the square ---> x2
    the cube ----> x3

    See the dilemma?

    For #60 yes that is ok now.
  7. Oct 11, 2009 #6
    thanks very much for helping me
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: I want check my answer ()()()
  1. I want check my answer (Replies: 1)

  2. I want check my answers (Replies: 10)