text: 1. Verify solution of equation
  
  HI!
  
  Directions: verify that the x-values are solutions of the equation.
  
  2cosx-1=0
  (a.) x= pi/3
  
  (b.) x= 5pi/3
  
  Thanks again!
  
  2. Originally Posted by overduex
  HI!
  
  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
  
  3. Originally Posted by Macleef
  Then, use your calculator to find the decimal values for cosx
  
  I dearly hope that anyone that would be expected to be able to solve such an equation would already have memorized
  $\displaystyle cos(60^o)= \frac{1}{2}$
  and not need to rely on a calculator to give them that answer.
  
  -Dan
  
  ,
  
  ,
  
  verify that x value
  
  Click on a term to search for related topics.
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