Question

2cos^2x-4cosx+1=0

Answer 1

Are we ask to solve for x ?

Answer 2

If so then assume cosx = m make this replacement so we get
2m^2-4m+1=0 Getting this ??

Answer 3

Now use quadratic formula to solve it for m

Answer 4

why do we need to use the quadratic formula

Answer 5

Because we cannot find the factors directly so we need to use the quadratic formula to find the solution. Okay ?

Answer 6

okay thanks

Answer 7

you are most Welcome :)

Answer 8

Bye :)