Results 1 to 3 of 3

Math Help - Solving a quadratic trig equation

  1. #1
    Newbie
    Joined
    Apr 2009
    Posts
    12

    Solving a quadratic trig equation

    Could someone help me with this question?

    2sin²(x) - √3 sin(x) = 0

    I am trying to solve for values of x.

    so far I have done the following, however, I am unsure if this is correct.

    let ' m ' = sinx

    therefore...

    m² - √3 = 0
    Last edited by mr fantastic; April 7th 2009 at 10:08 PM. Reason: Moved from another thread
    Follow Math Help Forum on Facebook and Google+

  2. #2
    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 Jd09 View Post
    Could someone help me with this question?

    2sin²(x) - √3 sin(x) = 0

    I am trying to solve for values of x.

    so far I have done the following, however, I am unsure if this is correct.

    let ' m ' = sinx

    therefore...

    m² - √3 = 0
    it would be 2m^2 - \sqrt 3 m = 0 would it not?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Dec 2008
    From
    Auckland, New Zealand
    Posts
    189
    It should be 2m^2 - \sqrt{3}m = 0

    \Rightarrow m(2m-\sqrt{3}) = 0

    Either m = 0 or m = \frac{\sqrt{3}}{2}

    So you need to simply solve \sin{x}=0 and \sin{x}=\frac{\sqrt{3}}{2}
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Solving Quadratic Trig Equations Algebraically
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: June 7th 2011, 08:20 AM
  2. Solving quadratic equation.
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: November 16th 2010, 04:54 PM
  3. Solving a quadratic equation
    Posted in the Algebra Forum
    Replies: 7
    Last Post: May 4th 2009, 08:49 PM
  4. Solving this Quadratic Equation!
    Posted in the Algebra Forum
    Replies: 2
    Last Post: November 8th 2007, 05:17 AM
  5. Solving a quadratic equation
    Posted in the Algebra Forum
    Replies: 4
    Last Post: October 29th 2007, 09:00 PM

Search Tags


/mathhelpforum @mathhelpforum