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**+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