+0  
 
0
75
1
avatar+175 

Solve for Cos(x), be sure to check for All Options that are possible (You only need to solve for Cos x, not x)

 

6cos^2x+17cosx=-5

Maplesnowy  May 31, 2018
 #1
avatar+12565 
+2

Let x = cos x   then substitute

6 x^2 +17 x = -5

6x^2 +17x +5=0      Use quadratic formula to find x = -1/3

cos x = -1/3   (?)

ElectricPavlov  May 31, 2018
edited by ElectricPavlov  May 31, 2018

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