Please help with number 17, I’m lost on how to even start it

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.

Graph a triangle (xyz) and reflect it over the line y=x to create triangle x’y’z’. describe the transformation using words. draw a line segment from point x to the reflecting line, and then draw a line segment from point x’ to the reflecting line. what do you notice about the two line segments you drew? do you think you would see the same characteristics if you drew the line segment connecting y with the reflecting line and then y’ with the reflecting line? how do you know?

Answer asap! urgent! will give brainliest!