Asked by james
                What are the steps for solving this? 
Directions Use the quadratic formula to solve the equation in the interval [0,2PI). Then use a graphing utility to approximate the angle x.
4cos^2x-4cosx-1=0
thanks.
            
        Directions Use the quadratic formula to solve the equation in the interval [0,2PI). Then use a graphing utility to approximate the angle x.
4cos^2x-4cosx-1=0
thanks.
Answers
                    Answered by
            bobpursley
            
    quadratic equation?
cosx= (4+-sqrt(16+4))/8
graph y=4cos^2 x - 4cosx + 1 and note where it crosses the y=0 axis.
    
cosx= (4+-sqrt(16+4))/8
graph y=4cos^2 x - 4cosx + 1 and note where it crosses the y=0 axis.
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