Question

Question #47726

Answer 1

`x = - 41^@67`
`x = 56^@67`

Explanation:

cos (2x - 15) = - 0.145
Calculator and unit circle gives 2 solutions:
`(2x - 15) = +- 98^@34`

a. 2x - 15 = 98.34
`2x = 98.34 + 15 = 113^@34`
`x = 56^@67`

b. 2x - 15 = - 98.34
`2x = - 98.34 + 15 = - 83.34`
`x = - 83.34/2 = - 41^@67`