Cos^2x-7cosx-8=0

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Solution for Cos^2x-7cosx-8=0 equation: 


Simplifying
Cos2x + -7cosx + -8 = 0

Reorder the terms:
-8 + -7cosx + os2xC = 0

Solving
-8 + -7cosx + os2xC = 0

Solving for variable 'c'.

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

Add '8' to each side of the equation.
-8 + -7cosx + 8 + os2xC = 0 + 8

Reorder the terms:
-8 + 8 + -7cosx + os2xC = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -7cosx + os2xC = 0 + 8
-7cosx + os2xC = 0 + 8

Combine like terms: 0 + 8 = 8
-7cosx + os2xC = 8

Add '-1os2xC' to each side of the equation.
-7cosx + os2xC + -1os2xC = 8 + -1os2xC

Combine like terms: os2xC + -1os2xC = 0
-7cosx + 0 = 8 + -1os2xC
-7cosx = 8 + -1os2xC

Divide each side by '-7osx'.
c = -1.142857143o-1s-1x-1 + 0.1428571429sC

Simplifying
c = -1.142857143o-1s-1x-1 + 0.1428571429sC

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