8cos^2(x)-2cos(x)-1=0

Solution for 8cos^2(x)-2cos(x)-1=0 equation:

Simplifying
8cos2(x) + -2cos(x) + -1 = 0

Multiply cos2 * x
8cos2x + -2cos(x) + -1 = 0

Multiply cos * x
8cos2x + -2cosx + -1 = 0

Reorder the terms:
-1 + -2cosx + 8cos2x = 0

Solving
-1 + -2cosx + 8cos2x = 0

Solving for variable 'c'.

Move all terms containing c to the left, all other terms to the right.

Add '1' to each side of the equation.
-1 + -2cosx + 1 + 8cos2x = 0 + 1

Reorder the terms:
-1 + 1 + -2cosx + 8cos2x = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -2cosx + 8cos2x = 0 + 1
-2cosx + 8cos2x = 0 + 1

Combine like terms: 0 + 1 = 1
-2cosx + 8cos2x = 1

Reorder the terms:
-1 + -2cosx + 8cos2x = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + -2cosx + 8cos2x = 0

The solution to this equation could not be determined.