Find the value of the polynomial $x^{2}-7 x+12$ at.
$x=4$
$2$
$0$
$4$
$3$
Classify the following polynomials as polynomials in one variable, two variables etc.
$x^{2}+x+1$
Write the degree of each of the following polynomials
$a x^{3}+b x^{2}+c x+d$
Factorise
$x^{3}+8 x^{2}+9 x-18$
Factorise
$8 x^{3}+27 y^{3}+125 z^{3}-90 x y z$
Find the value of
$x^{3}-8 y^{3}-36 x y-216,$ when $x=2 y+6$