Cos^2x-2cosx+9=0

Simple and best practice solution for Cos^2x-2cosx+9=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for Cos^2x-2cosx+9=0 equation: 


Simplifying
Cos2x + -2cosx + 9 = 0

Reorder the terms:
9 + -2cosx + os2xC = 0

Solving
9 + -2cosx + os2xC = 0

Solving for variable 'c'.

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

Add '-9' to each side of the equation.
9 + -2cosx + -9 + os2xC = 0 + -9

Reorder the terms:
9 + -9 + -2cosx + os2xC = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -2cosx + os2xC = 0 + -9
-2cosx + os2xC = 0 + -9

Combine like terms: 0 + -9 = -9
-2cosx + os2xC = -9

Add '-1os2xC' to each side of the equation.
-2cosx + os2xC + -1os2xC = -9 + -1os2xC

Combine like terms: os2xC + -1os2xC = 0
-2cosx + 0 = -9 + -1os2xC
-2cosx = -9 + -1os2xC

Divide each side by '-2osx'.
c = 4.5o-1s-1x-1 + 0.5sC

Simplifying
c = 4.5o-1s-1x-1 + 0.5sC

See similar equations:

| 5/3x-1/4=1/2 | | 4(8)-4=8 | | X+8*2=5 | | -2.33333333x+3.5=-1.4 | | 6z-76=80 | | 9x+4-2x+(-8)=45 | | 4n-2=2n+8 | | 3x-5(x-3)=-5+3x+10 | | -2.33x+3.5=-1.4 | | 1.5d+6.75=3+2.25 | | X+6*5=3 | | 3x+11=4x-12 | | 1.10=(1-x)+x | | 3x-5(x-3)=-5+10 | | 8x^2-16x-1=0 | | 8-4-2x+4x=12 | | 9.25x-(8.25x+12.1)=-(x+18.9)-4.2 | | r=2t(4)-1 | | 6x+5x-17=15 | | f(x)=x^4-x/x^5-x | | r=2t(2)-1 | | 6x-4+2x+8=52 | | x^3+2*x^2-3=0 | | r=2t(0)-1 | | 40+b=40+2 | | 4x+22=6x+5 | | f(x)=x^3-x-2 | | 26x+4= | | r=2(-2)-1 | | 0.5-cosx=0 | | -40=-2[3n-4] | | 3x+6=18x |

Equations solver categories