Expand the following:
$(3 a-2 b)^{3}$
If $x+y=-4,$ then what is the value of $x^{3}+y^{3}-12 x y+64 ?$
Find the value of the polynomial $x^{2}-7 x+12$ at.
$x=1$
Factorise :
$x^{2}+9 x+18$
Write the following cubes in expanded form
$(3 a+5 b)^{3}$