A5. What sequence do the zeros of the polynomial $p(x)=-2 x^{3}+6 x$ form?
(A) arithmetic sequence
(B) geometric sequence
(C) infinite sequence
(D) constant sequence
(E) alternating sequence
A5. The zeros of the polynomial $p(x)$ are $-\sqrt{3}, 0, \sqrt{3}$, which are terms of an arithmetic sequence. Thus, $d=0-(-\sqrt{3}) = \sqrt{3}$ or $d=\sqrt{3}-0=\sqrt{3}$.