Question 698406
y=-0.5(x-3)^2+5

when x= 3 , y =5
when x= -1, y=-3
when x= 1, y=3
when x= 2, y=4.5
when x=6, y =0.5

Plot these points . You could plot many more points and draw the graph

{{{drawing(300,300,-10,10,-10,10,grid(1),circle(3,5,0.3),circle(-1,-3,0.3),circle(1,3,0.3),circle(2,4.5,0.3),circle(6,0.5,0.3),graph(300,300,-10,10,-10,10,y=-0.5(x-3)^2+5))}}}