2cos^2(x)+9cosx=-4

Simple and best practice solution for 2cos^2(x)+9cosx=-4 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 2cos^2(x)+9cosx=-4 equation: 


Simplifying
2cos2(x) + 9cosx = -4

Multiply cos2 * x
2cos2x + 9cosx = -4

Reorder the terms:
9cosx + 2cos2x = -4

Solving
9cosx + 2cos2x = -4

Solving for variable 'c'.

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

Reorder the terms:
4 + 9cosx + 2cos2x = -4 + 4

Combine like terms: -4 + 4 = 0
4 + 9cosx + 2cos2x = 0

The solution to this equation could not be determined.

See similar equations:

| a-b-7=p | | (-8x^4+4x^3+6x^2-5x+1)=0 | | 6x-13=5x+3 | | 5x-9=43 | | r(x)=1000(1-x/500)^2 | | 88=2(-5-7x) | | 6(3x-1)-(x-3)=18x+3 | | F(0)=3*-4 | | F(2.5)=3*-4 | | (5d-2)+(6d(6d)+4d)-(2d-1)= | | -24+x=x+21 | | -6(6+5X)=-156 | | (x^4-5x^2+2x)-(9x^3+x^2-3x+6)=0 | | 5130000000000*.01=x | | F(-3)=3*-4 | | 9x^2-3x-30=0 | | 3-x=2x+2 | | c=7.50h+3 | | -5x-2x=-77 | | 1y=1x+4 | | F(5)=3*-4 | | x=7125000000*720 | | v=9.5*11.5*16 | | 8x+3x=10x | | 8t^2-3t-26=0 | | 4q^2+100=8q | | (-2x+160)+(11x-25)=180 | | 8(n+5)+3=107 | | 3X(X+3)=3X(2X-1) | | 6x^2-27-15=0 | | 17-13a=5a+1-16a | | -2+4d-7d=17 |

Equations solver categories