Factorise
$16 x^{4}-y^{4}$
$\left(4 x^{2}+y^{2}\right)(2 x+y)(2 x-y)$
Expand
$(11 x+18)(11 x-18)$
Factorise the following:
$4 x^{2}+20 x+25$
Classify the following polynomials as polynomials in one variable, two variables etc.
$x y+y z+z x$
$16 x^{2}-40 x y+25 y^{2}$
If $(5 x-3)^{2}=25 x^{2}+k x+9,$ then find $k$
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