Determine the point(s) of intersection algebraically. Then verify your result numerically by creating a table of values for each equation.
What I have so far is:
I set them equal to each other: 2x^2=-2x^2+324
Then I added 2x^2 to each side: 4x^2=324
Then I divided each side by 4: x^2=81
Then I took the square root of each side: x=9.
Where do I go from here...is that the only point of intersection???