A1. What is the leading coefficient of the polynomial $p(x)=\sqrt{18} x^{4}-\sqrt{8} x^{4}-3 x^{2}+3$?
(A) -3
(B) $\sqrt{10}$
(C) $\sqrt{2}$
(D) 3
(E) $-\sqrt{8}$
A1. The leading coefficient of the polynomial $p(x)$ is $\sqrt{18}-\sqrt{8}=3 \sqrt{2}-2 \sqrt{2}=\sqrt{2}$.