- #1

- 24

- 0

Having a tough time with this one and i'm not sure why.

Need to state amplitude, period and phase shift of f(x)=3cos2[x-(π/4)]+1.

Amplitude being 3, period being 2π/2=π and phase shifted (π/4) to the right.

Midline would also be at y=1

Good so far?

Right, so I know that 1/4 phase would be π/4 and therefore plotting five points from the initial (π/4,4) would give me (π/2, 1), (3π/4, -2), (π, 1), (5π/4, 4)

But then plugging the initial equation into a graphing software it appears that the points do not line up.

Can anyone confirm whether this is correct?

I have been through ALL of Khan Academys videos and this lesson is driving me f'n nuts.

ANY help appreciated. Cheers