Barry M. answered 01/17/20
Professor, CalTech Grad; Many Years Tutoring Math, SAT/ACT Prep, Chem
The graph shows f(x) and requests a graph of - f(x).
So just reflect through the x-axis. For any given point with coordinate (x,y), replace the y value with -y while keeping x the same. Do that at the left and right ends of the domain, and for enough points to catch changes of direction (maxima and minima). Then connect the dots.