SOLUTION: cos^2(x)+3cos(x)-1=0

SOLUTION: cos^2(x)+3cos(x)-1=0

Algebra.Com

Question 1150592: cos^2(x)+3cos(x)-1=0
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

Let

For a quadratic equation of the form the solutions are:

in your case , ,

and
Substitute back :
=> ,
or
=> , so, disregard it

solutions in decimal form

RELATED QUESTIONS
Solve the equation graphically: -cos^3 x + 3cos^2 x = 2sin x =... (answered by stanbon)

Factor and simplify {{{ 3cos^2(x)+cos(x)-4... (answered by Alan3354)

If sin(x) + sin^2(x) = 1, then the value of cos^12(x) + 3cos^10(x) + 3cos^8(x) + cos^6(x) (answered by ikleyn,Edwin McCravy,AnlytcPhil)

Find the complete solution of the equation {{{cos(x)sin^2(x)-(3cos(x))/4 = 0}}} in... (answered by Edwin McCravy,solver91311)

Solve for all 0 degrees less than or equal to x less than 360 degrees. 3tan x- sqrt( 3... (answered by lwsshak3)

-3cos(pi/2 - X) =... (answered by ikleyn)

what is the amplitude, period, vertical and horizontal translations, vertical asymptotes... (answered by lwsshak3)

What is the period of y=1/3cos... (answered by MathLover1)

Solve {{{sin^2(x)}}} =... (answered by Edwin McCravy)