SOLUTION: Where are the x-intercepts for f(x) = 4 cos(2x − π) from x = 0 to x = 2π?
I have no idea where to begin. On WolframAlpha, it says the x int's are npi/2 - pi/4, w
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Question 876351: Where are the x-intercepts for f(x) = 4 cos(2x − π) from x = 0 to x = 2π?
I have no idea where to begin. On WolframAlpha, it says the x int's are npi/2 - pi/4, where n is an element of the integers. I do not know how they arrived at that answer.
I know the amplitude is 4, the period is pi, but when I solve bx - h = 0 I get pi/2, but not pi/2 - pi/4. How do they obtain this answer?
Many thanks for your help
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
when and
So then,
and
and
and
And since cosine is periodic in
and
You can combine those two together to get the Wolfram answer.
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