What is the amplitude, period, phase shift and vertical displacement of #y=-2cos2(x+4)-1#?
Found right in the equation the first number:
You can also calculate it, but this is faster. The negative before the 2 is telling you that there will be a reflection in the x axis.
First find k in equation:
Then use this equation:
This part of the equation tells you that the graph will shift left 4 units.
The -1 tells you that the graph will shift 1 unit down.