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Please look at the image. I already figured out b, which I'm pretty sure is 2pi/3. However, I'm confused on figuring out a. This is what I tried:

 

y= -2sin(3x)+1

y= -2sin(3*-pi/12)+1

y= -2sin(-pi/4)+1

I used the unit circle to find sin(-pi/4).

y=-2(-√2/2)+1

y=√2+1

y=2.41421356

 

My answer isn't correct, so could anyone please explain how I should solve for b? Thanks!

 

 Jul 4, 2021
 #1
avatar+33376 
+3

When x = - pi/12     what is sin   -3 pi/12  ?         =      - sqrt2/2

 

-2  *  -sqrt2/2  +1 = a

 

 

Do simialr for 'b'        2* sin 3b + 1 = 1 

                                  2 * sin 3b = 0

                                        sin 3b = 0

                                           b =    pi/3

 Jul 5, 2021
 #2
avatar+114012 
0

Thanks EP

 

Are you happy with the answer nimi?   

I see you have given EP a point, that is nice, but It would be good if you responded as well.

 Jul 10, 2021
edited by Melody  Jul 10, 2021

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