Results 1 to 2 of 2

Math Help - Trig problem

  1. #1
    Newbie
    Joined
    May 2007
    Posts
    2

    Cool Trig problem

    Please help with this equation (I'm math illiterate!) Thanks in advance.

    Solve 2sinx^2 - 7sinx= -3 for x, where 0< x < 360 degrees.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by brewerangel View Post
    Please help with this equation (I'm math illiterate!) Thanks in advance.

    Solve 2sinx^2 - 7sinx= -3 for x, where 0< x < 360 degrees.
    This is a quadratic in sin(x), so put y=sin(x), then we have:

    2 y^2 -7 y +3 =0,

    use the quadratic formula to find that y=1/2 or y= 3.

    Now there are no angles in the given range for which sin(x)=3 so we need
    only examine y = sin(x) =1/2, which has solutions x=30, and x= 150 degrees
    in the given range.

    RonL
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Help with Trig problem
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: October 16th 2011, 02:25 PM
  2. Trig word problem - solving a trig equation.
    Posted in the Trigonometry Forum
    Replies: 6
    Last Post: March 14th 2011, 07:07 AM
  3. Replies: 3
    Last Post: January 2nd 2011, 08:20 PM
  4. Trig problem
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: December 14th 2009, 11:34 AM
  5. Trig Problem
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: November 21st 2008, 07:45 PM

Search Tags


/mathhelpforum @mathhelpforum