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Math Help - Verify solution of equation

  1. #1
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    Verify solution of equation

    HI!
    could anyone please help? If you would please explain one part, I can attempt to do the other. Thanks in advance!

    Directions: verify that the x-values are solutions of the equation.

    2cosx-1=0
    (a.) x= pi/3

    (b.) x= 5pi/3

    Thanks again!
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  2. #2
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    Quote Originally Posted by overduex View Post
    HI!
    could anyone please help? If you would please explain one part, I can attempt to do the other. Thanks in advance!

    Directions: verify that the x-values are solutions of the equation.

    2cosx-1=0
    (a.) x= pi/3

    (b.) x= 5pi/3

    Thanks again!
    First, convert the radians to degrees
    Then, use your calculator to find the decimal values for cosx
    For example, in question a)
    cos(pi/3) or cos60 = 0.5
    Then sub in the value of 0.5 in the equation "2cosx - 1 = 0"
    And solve:
    2cos(0.5) - 1 = 0
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  3. #3
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Macleef View Post
    Then, use your calculator to find the decimal values for cosx
    Owwch Mommy, my head hurts!!

    I dearly hope that anyone that would be expected to be able to solve such an equation would already have memorized
    cos(60^o)= \frac{1}{2}
    and not need to rely on a calculator to give them that answer.

    -Dan
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