SOLUTION: For the life of me, I cannot solve 4cos^2x - sinx -5 = 0. Any help would be appreciated.

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Question 167218: For the life of me, I cannot solve 4cos^2x - sinx -5 = 0. Any help would be appreciated.
Answer by Edwin McCravy(20056)   (Show Source): You can put this solution on YOUR website!
For the life of me, I cannot solve 4cos^2x - sinx -5 = 0. Any help would be appreciated 


Use the Pythagorean identity 
to replace  by 







Multiply thru by 



This is a quadratic in 

But it can have no solution since the discriminant
would be negative  

Edwin
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