Question

precalculus equation question on my quiz due im going to tutor tomorrow but dont know it please help!? :/

Answer 1

That equation is equivalent to :
\[14\cos ^2x+8\cos x-1=0\]
The factors are:
\[(7\cos x-1)(\cos x-1)=0\]
Set each factor equal to 0 and solve.

Answer 2

how do i get four answers out of that like the question asks? isnt it just 1/7cos and 1/cos??

Answer 3

You should get 3 answers, not 4.

Answer 4

cos x = 1/7 so x = 81.8, 278.2
cos x = 1 so x = 0 degrees