Question

NEED HELP ASAP, TEST!! Solve the equation 2 cos (x) +1=0,0 ≤ x ≤ 2pi. Show all of your work.​

Answer 1

Answer: $cos(x) = -\frac{1}{2}$

Work:

1. Subtract 1 from both sides

$2cos(x)+1-1=0-1$

2. Simplify

$2cos(x)=-1$

3. Divide both sides by 2

$\frac{2cos(x)}{2}=\frac{-1}{2}$

4. Simplify

$cos(x)=-\frac{1}{2}$