Factorise :

$84-2 r-2 r^{2}$

Find $p(-2)$ for the polynomial $p(x)=5 x^{2}-11 x+3$

Find the value of

$x^{3}+y^{3}-12 x y+64,$ when $x+y=-4$

The zero of polynomial $p(x)=b x+m$ is $\ldots \ldots \ldots$

For $p(x)=x^{3}+9 x^{2}+26 x+24$ $p(-2)=\ldots \ldots \ldots$