Question

How do you solve `5+4cosx-1=0`?

Answer 1

`x = (2k + 1)pi`

Explanation:

5 + 4cos x - 1 = 0
4cos x = - 4
cos x = - 1
Trig unit circle -->
cos x = - 1 --> `x = pi`
General answers:
`x = pi + 2kpi = (2k + 1)pi`