SOLUTION: Solve equation for all value of ø if ø measure in degrees cos^2ø -5/2cosø -3/2=0

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Question 399986: Solve equation for all value of ø if ø measure in degrees
cos^2ø -5/2cosø -3/2=0
Answer by ewatrrr(10682) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

cos^2ø -5/2cosø -3/2=0

factoring

(cosø -3)(cosø + 1/2)= 0

(cosø -3)= 0 

 cosø = 3 

(cosø + 1/2)= 0

    cosø = -1/2

       ø is 120° or 240°