f(x)= -2 sqrt x-1

Question

I would like to know the points on the graph

Answer 1

First, put parentheses around x-1 if that is what you are taking the square root of.

 

Secondly, choose values of x, from 1 onward, and do the calculation. In this way you can record a table of (x,y) values (ordered pairs) representing points on the graph.