Results 1 to 3 of 3

Math Help - how to expand these brackets please?

  1. #1
    Newbie
    Joined
    Oct 2007
    Posts
    18

    how to expand these brackets please?

    x = (1/2 (y+1))^2

    so: (1/2 (y+1)) ( 1/2 (y+1))

    The answer supposed to be: 1/4 y^2 + y + 3/4

    But cant work it out with the FOIL method.

    Thank you
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Forum Admin topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    9,939
    Thanks
    338
    Awards
    1
    Quote Originally Posted by maxmadx View Post
    x = (1/2 (y+1))^2

    so: (1/2 (y+1)) ( 1/2 (y+1))

    The answer supposed to be: 1/4 y^2 + y + 3/4

    But cant work it out with the FOIL method.

    Thank you
    Why not?
    \left ( \frac{1}{2} (y+1) \right )\left ( \frac{1}{2} (y+1) \right )

    = \frac{1}{2} \cdot \frac{1}{2} (y + 1)(y + 1)

    Can you do it now?

    -Dan
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    Joined
    Apr 2005
    Posts
    1,631
    Quote Originally Posted by maxmadx View Post
    x = (1/2 (y+1))^2

    so: (1/2 (y+1)) ( 1/2 (y+1))

    The answer supposed to be: 1/4 y^2 + y + 3/4

    But cant work it out with the FOIL method.

    Thank you
    Could it be that the reason you thought you could not work it out by FOIL was because the answer is not as you posted?

    [(1/2)(y+1)]^2
    = (1/4)(y^2 +2y +1)
    = (1/4)y^2 +(1/2)y +1/4
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Brackets
    Posted in the Calculus Forum
    Replies: 4
    Last Post: November 21st 2010, 12:00 PM
  2. Brackets
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: January 26th 2010, 12:21 PM
  3. expand brackets
    Posted in the Algebra Forum
    Replies: 2
    Last Post: December 8th 2009, 08:34 AM
  4. brackets within brackets
    Posted in the Statistics Forum
    Replies: 11
    Last Post: October 4th 2009, 08:18 AM
  5. brackets
    Posted in the Algebra Forum
    Replies: 4
    Last Post: May 12th 2009, 07:51 AM

Search Tags


/mathhelpforum @mathhelpforum