Question

Choose the equation that does not represent the function of the graph shown below.

y = 3 sin 8x
y = -3 sin 8(x + pi)
y = 3 sin 8(x - pi/2)
y = -3 sin 8x

Answer 1

y = 3 sin 8( x -pi/2 )

Is the correct answer

Because the question ask which one is NOT

Answer 2

The equation for that graph is f(x) = 3 sin 8x. Nothing else is correct. THere is no horizontal shift (phase shift), nor is there vertical shift. Just a period adjustment.