Which chess piece starts on squares a1 and h1, and a8 and h8

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

I’m stuck on this equation, anyone got the answer?