Consider the function y 2cosx pie What effect does 2 have

Consider the function y = -2cos(x - pie). What effect does \"-2\" have on the basic graph Horizontal compression by factor 2 Vertical compression by factor 2 Vertical stretch by factor 2 then flip over horizontal axis. Horizontal stretch by factor 2 then flip over verticalaxis

Solution

multiplying by 2 ==> vertical stretch by factor 2.

negative sign ==> flip over horizontal axis.

==> -2 ==> vertical stretch by factor 2 and flip over horizontal axis.

option C