Results 1 to 4 of 4

Math Help - Functions help!!!!

  1. #1
    Newbie
    Joined
    Sep 2008
    Posts
    23

    Functions help!!!!

    1)Use transformations to plot y=3f[-1/2(x+1)]-4 given that f(x)=lxl

    2) For the function defined by f(x)=-x^3-3, determine the inverse

    3) Determine equations for 2 functions on graph. And also state the Domain and Range


    And sketch the inverse
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by haddad287 View Post
    1)Use transformations to plot y=3f[-1/2(x+1)]-4 given that f(x)=lxl
    see post #4 here

    2) For the function defined by f(x)=-x^3-3, determine the inverse
    write y = -x^3 - 3

    now, switch x and y and solve for y. this will give you the inverse function


    3) Determine equations for 2 functions on graph. And also state the Domain and Range


    And sketch the inverse
    your graph, at least to me, is not accurate enough to know what the formulas are. the somewhat curvy part looks like 2 \sqrt{x + 1}. the other part however, i would do it using two straight lines. the question makes me think this is a single graph though, and so, i am thinking some shifted |x| graph. perhaps -|x + 5| + 6. but this doesn't fit all the characteristics, namely, the x-intercepts.

    so this function is piecewise defined.

    anyway, for the inverse function, draw (faintly) the line y = x and reflect the graph in it

    the domain is the set of x-values for which the function is defined and the range is the set of y-values for which the function is defined.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2008
    Posts
    23
    For the first one. I need to see the graph. Would it be possiable for you to fraw it for me?

    For the second one, so would it be?
     <br />
y=-x^3-3<br />
     <br />
x=-y^3-3<br />
     <br />
y^3=x-3<br />

    how would I finish it?

    And for the third one. What would also be my D and R?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by haddad287 View Post
    For the first one. I need to see the graph. Would it be possiable for you to fraw it for me?
    i gave you the rules you need to draw it on your own

    For the second one, so would it be?
     <br />
y=-x^3-3<br />
     <br />
x=-y^3-3<br />
     <br />
y^3=x-3<br />

    how would I finish it?
    take the cube root of both sides (what you have is wrong, by the way. why is the x positive?)

    And for the third one. What would also be my D and R?
    i told you how to find those, i won't do it for you. read what i said and think about it
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 0
    Last Post: April 15th 2010, 06:50 PM
  2. Replies: 3
    Last Post: February 23rd 2010, 05:54 PM
  3. Replies: 11
    Last Post: November 15th 2009, 12:22 PM
  4. Replies: 7
    Last Post: August 12th 2009, 05:41 PM
  5. Replies: 1
    Last Post: April 15th 2008, 10:00 AM

Search Tags


/mathhelpforum @mathhelpforum