We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
312
1
avatar+193 

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

 May 31, 2018
 #1
avatar+18754 
+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   (?)

 May 31, 2018
edited by ElectricPavlov  May 31, 2018

13 Online Users

avatar