Results 1 to 2 of 2

Math Help - use the square root property

  1. #1
    Newbie
    Joined
    Dec 2007
    Posts
    17

    use the square root property

    (x+20)squared = 49
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member wingless's Avatar
    Joined
    Dec 2007
    From
    Istanbul
    Posts
    585
    (x+20)^2 = 49
    We can square root both sides.

    If x^2 = a, then |x| = \sqrt {a}.
    NOT x = \sqrt {a} !!

    So,
    (x+20)^2 = 49
    |x+20| = \sqrt{49}
    |x+20| = 7
    x+20 = +7 and x+20 = -7

    x+20 = +7
    x = -13

    x+20 = -7
    x = -27

    x = \{-27,-13\}
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Square root inside square root equation
    Posted in the Algebra Forum
    Replies: 3
    Last Post: October 10th 2011, 04:17 PM
  2. Need Help with nth root property
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: April 15th 2011, 05:52 AM
  3. Replies: 3
    Last Post: December 3rd 2009, 08:53 AM
  4. Replies: 12
    Last Post: November 22nd 2008, 12:41 PM
  5. Complex numbers and square root property
    Posted in the Math Topics Forum
    Replies: 9
    Last Post: April 29th 2008, 03:29 PM

Search Tags


/mathhelpforum @mathhelpforum