Results 1 to 4 of 4

Math Help - Divide/simplify expressions

  1. #1
    Member
    Joined
    Dec 2009
    Posts
    122

    Divide/simplify expressions

    Please help me check my answer for the following expressions: 1) Divide the following: (x^2 + 10x + 21) divided by (x + 7) I have x^2 + 3?
    2) Simplify 9/y + 3 + 2y/y + 6 I have 2y^2+15y+54/(y+3)(y+6) ?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,408
    Thanks
    1294
    Quote Originally Posted by jay1 View Post
    Please help me check my answer for the following expressions: 1) Divide the following: (x^2 + 10x + 21) divided by (x + 7) I have x^2 + 3?
    2) Simplify 9/y + 3 + 2y/y + 6 I have 2y^2+15y+54/(y+3)(y+6) ?
    1. \frac{x^2 + 10x + 21}{x + 7} = \frac{(x + 7)(x + 3)}{x + 7}

     = x + 3.


    2. \frac{9}{y} + 3 + \frac{2y}{y} + 6

     = \frac{9}{y} + \frac{3y}{y} + \frac{2y}{y} + \frac{6y}{y}

     = \frac{9 + 11y}{y}

     = \frac{9}{y} + 11.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Dec 2009
    Posts
    122
    Quote Originally Posted by Prove It View Post
    1. \frac{x^2 + 10x + 21}{x + 7} = \frac{(x + 7)(x + 3)}{x + 7}

     = x + 3.


    2. \frac{9}{y} + 3 + \frac{2y}{y} + 6

     = \frac{9}{y} + \frac{3y}{y} + \frac{2y}{y} + \frac{6y}{y}

     = \frac{9 + 11y}{y}

     = \frac{9}{y} + 11.
    I apologize< I should've used parentheses on number 2; it should read: 9/(y+3) + 2y/(y+6)
    Is my answer above correct in this case?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Senior Member Stroodle's Avatar
    Joined
    Jun 2009
    Posts
    367
    Yep, \frac{2y^2+15y+54}{(y+3)(y+6)} is correct


    By the way, you should use parentheses for both the numerator and the denominator.
    i.e. (2y^2+15y+54)/((y+3)(y+6)).

    2y^2+15y+54/(y+3)(y+6) could be interpreted as 2y^2+15y+\frac{54}{y+3}(y+6)

    Otherwise it's not hard to use Latex to write these problems; there's a thread on how to use it.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. simplifing expressions divide
    Posted in the Math Topics Forum
    Replies: 6
    Last Post: January 31st 2010, 10:15 AM
  2. Replies: 2
    Last Post: November 29th 2008, 09:51 AM
  3. Divide and simplify
    Posted in the Algebra Forum
    Replies: 1
    Last Post: June 16th 2008, 03:48 PM
  4. Divide and simplify
    Posted in the Algebra Forum
    Replies: 1
    Last Post: June 4th 2008, 06:02 PM
  5. divide and simplify complex fractions
    Posted in the Algebra Forum
    Replies: 1
    Last Post: April 19th 2007, 10:59 AM

Search Tags


/mathhelpforum @mathhelpforum