Results 1 to 8 of 8

Math Help - Adding Square Roots

  1. #1
    Member OnMyWayToBeAMathProffesor's Avatar
    Joined
    Sep 2006
    Posts
    157

    Post Adding Square Roots

    hello. i need to add square root (25)+square root (24)+square root (21)+square root (16)+square root (9). Please can i get this answer in radical form and true form because i do not know how. thanxs a lot. also please xplain the process.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Global Moderator

    Joined
    Nov 2005
    From
    New York City
    Posts
    10,616
    Thanks
    9
    Quote Originally Posted by OnMyWayToBeAMathProffesor View Post
    hello. i need to add square root (25)+square root (24)+square root (21)+square root (16)+square root (9). Please can i get this answer in radical form and true form because i do not know how. thanxs a lot. also please xplain the process.
    \sqrt{25}=5

    \sqrt{24}=\sqrt{4\cdot 6}=2\sqrt{6}

    \sqrt{21}=\sqrt{3\cdot 7} (Not simplified)

    \sqrt{16}=4

    \sqrt{9}=3
    Add,
    12+2\sqrt{6}+\sqrt{21}
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member OnMyWayToBeAMathProffesor's Avatar
    Joined
    Sep 2006
    Posts
    157

    replay to perfect hacker

    is that the simplest form? 12+ 2 square root (6)+ square root (21)? also if i wanted to multiply that by 4 how would i proceed? thanxs a lot again.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Global Moderator

    Joined
    Nov 2005
    From
    New York City
    Posts
    10,616
    Thanks
    9
    Quote Originally Posted by OnMyWayToBeAMathProffesor View Post
    is that the simplest form? 12+ 2 square root (6)+ square root (21)? also if i wanted to multiply that by 4 how would i proceed? thanxs a lot again.
    Yes.
    Unless you want to write,
    12+2\sqrt{3}\cdot \sqrt{2}+\sqrt{3}\cdot \sqrt{7}
    Thus,
    12+\sqrt{3}(2\sqrt{2}+\sqrt{7})
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Feb 2008
    Posts
    2

    My Kids are now asking me questions I can no longer answer

    how do I do the following.

    Square Root of 48 -Square Root of 75 +Square Root of 12.

    The 75 is throwing me.

    Many thanks for all your help.

    I Used 2 Know This.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    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 Iused2KnowThis View Post
    how do I do the following.

    Square Root of 48 -Square Root of 75 +Square Root of 12.

    The 75 is throwing me.

    Many thanks for all your help.

    I Used 2 Know This.
    \sqrt{75} = \sqrt{3 \cdot 25} = \sqrt{3} \sqrt{25} = 5 \sqrt{3}
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Newbie
    Joined
    Feb 2008
    Posts
    2
    Thats what I done, but how do a put 5 x Square root 3 back into the equation, when the other answers are based around square root of 12

    I looked at the answer at the back of the book and answer is Square Root 3.

    Thanks
    Follow Math Help Forum on Facebook and Google+

  8. #8
    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 Iused2KnowThis View Post
    Thats what I done, but how do a put 5 x Square root 3 back into the equation, when the other answers are based around square root of 12

    I looked at the answer at the back of the book and answer is Square Root 3.

    Thanks
    \sqrt{48} = 4 \sqrt{3} and \sqrt{12} = 2 \sqrt{3} by the same method as before.

    so you have 4 \sqrt{3} - 5 \sqrt{3} + 2 \sqrt{3}
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Adding Square Roots raised to a power
    Posted in the Algebra Forum
    Replies: 2
    Last Post: June 20th 2011, 04:42 PM
  2. Adding infinite square roots
    Posted in the Algebra Forum
    Replies: 4
    Last Post: September 1st 2009, 01:14 AM
  3. Adding square roots (easy question)
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: July 21st 2009, 08:11 PM
  4. Adding Square Roots
    Posted in the Algebra Forum
    Replies: 7
    Last Post: May 3rd 2008, 08:16 AM
  5. Adding Square Roots
    Posted in the Algebra Forum
    Replies: 1
    Last Post: April 17th 2007, 07:43 PM

Search Tags


/mathhelpforum @mathhelpforum