Question

.the function f(x)=-3cos(2x+pi/4) has
a) amplitude 3 and period 2pi
b) amplitude 3 and period 4pi
c) amplitude 3 and period pi
d) amplitude 2 and period 2pi/3

Answer 1

Put your equation into the form \[y=Acos(wx-\phi)\] and your Amplitude will be \[\left| A \right| \] and your period will be \[T=\frac{ 2\pi }{ \omega } \] Please note that the w should be an omega, I am just having a hard time with this equation editor. It doesn't like me!

Answer 2

so its c?

Answer 3

There you go! That's all there is to it. Good job.