SOLUTION: Please help! Do not understand!! Find the solutions of the given equation in the indicated interval. (Give your answers to two decimal places. Enter your answers as a comma-separa

Question 963709: Please help! Do not understand!!
Find the solutions of the given equation in the indicated interval. (Give your answers to two decimal places. Enter your answers as a comma-separated list.)
20 (cos(x))^2 + cos(x) − 1 = 0, [0, π]

Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Find the solutions of the given equation in the indicated interval. (Give your answers to two decimal places. Enter your answers as a comma-separated list.)
20 (cos(x))^2 + cos(x) − 1 = 0, [0, π]
***

solve for cosx by quadratic formula

a=20, b=1, c=-1
ans:
cosx=-0.25
x=1.82 radians
or
cosx=0.2
x=1.37 radians
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