Results 1 to 4 of 4

Math Help - Square Rooting Both Sides of the Equality

  1. #1
    Junior Member
    Joined
    Apr 2011
    From
    United States
    Posts
    32

    Square Rooting Both Sides of the Equality

    Hey

    When you are square rooting both sides of the equality, why do you have to apply plus or minus?

    x^2 = 4
    x = + or - sqrt(4)

    NOTE: I reinstalled windows and couldn't use MathType to generate TEX.

    Sam
    Follow Math Help Forum on Facebook and Google+

  2. #2
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1

    Re: Square Rooting Both Sides of the Equality

    Quote Originally Posted by ArcherSam View Post
    Hey

    When you are square rooting both sides of the equality, why do you have to apply plus or minus?

    x^2 = 4
    x = + or - sqrt(4)

    NOTE: I reinstalled windows and couldn't use MathType to generate TEX.

    Sam
    Because (-x)^2 = (-x) \cdot (-x) = x^2

    By the way \sqrt{4} = 2

    For tex wrap your equation with [tex]...[/tex] where ... represents your equation. For example my first line is [tex](-x)^2 = (-x) \cdot (-x) = x^2[/tex]

    You can also quote someone else's post and see what they've done
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Apr 2011
    From
    United States
    Posts
    32

    Re: Square Rooting Both Sides of the Equality

    @e^(i*pi)

    Okay, because even powers can input negative and postive values, you include the plus and minus to account for this property. I see!

    Sam
    Follow Math Help Forum on Facebook and Google+

  4. #4
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1

    Re: Square Rooting Both Sides of the Equality

    Quote Originally Posted by ArcherSam View Post
    @e^(i*pi)

    Okay, because even powers can input negative and postive values, you include the plus and minus to account for this property. I see!

    Sam
    That's it
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Help - Square rooting a complex number
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: January 18th 2010, 11:23 AM
  2. Replies: 1
    Last Post: October 13th 2009, 09:36 PM
  3. Simple square rooting confusion
    Posted in the Algebra Forum
    Replies: 3
    Last Post: January 22nd 2009, 08:11 AM
  4. Two Sides of a Square Divided by a Circle
    Posted in the Geometry Forum
    Replies: 1
    Last Post: November 13th 2008, 10:56 AM
  5. Find equation of the sides of a square
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: December 15th 2006, 08:10 AM

/mathhelpforum @mathhelpforum