Evaluate the following using suitable identities

$(995)^{3}$

Factorise

$16 x^{2}-16 x-21$

Factorise :

$3 x^{3}-x^{2}-3 x+1$

Find the zero of the polynomial $p(x)=5 x-8$.

By remainder Theorem find the remainder, when $p(x)$ is divided by $g(x),$ where

$p(x)=x^{3}-6 x^{2}+2 x-4, \quad g(x)=1-\frac{3}{2} x$