Question 284117
This is an upside down parabola.

Just select about 6 different values for x and then simplify to find y values that together make points in the form (x,y).

Let y = f(x).

y = -3x^2 + 8x

For example, if x = 0, find y.

y = -3(0)^2 + 8(0)

y = 0 + 0

y = 0

This makes the point (0,0).  You can now plot this point on the xy-plane.

Find other points in the same way.  When you have about 5 or 6 points, plot each point and then connect them with a smooth curve.

Can you finish now?