Question

find any points of discontinvity

Answer 1

You are asked to look for any points of discontinuity. They are like holes in the graph.
This occurs where the denominator becomes zero.
2x^2 - 18 = 0 2x^2 = 18 x^2 = 9 x = +3 or -3.
So when x = 3 and x = -3, there would be point discontinuities in the graph.