Answer:
Step-by-step explanation:
Maximum value is when cos x = 1
So it is -2 + 4(1) = 2.
Minimum value, when cos x = -1:
= -2 + 4(-1) = -6.
the answer is option A........
consider expanding into the brackets, helpful?
Very good job! They are all correct and it shows how you got the answer! ^_^ 100%