Factorise
$27 x^{3}-y^{3}+64 z^{3}+36 x y z$
$(3 x-y+4 z)\left(9 x^{2}+y^{2}+16 z^{2}+3 x y\right.$$+4 y z-12 z x)$
$16 x^{2}+40 x y+25 y^{2}$
Classify the following as a constant, linear,quadratic and cubic polynomials:
$\sqrt{2} x-1$
Write the degree of the following polynomials
$\sqrt{11} t+14$
Find the following products:
$\left(\frac{x}{2}+2 y\right)\left(\frac{x^{2}}{4}-x y+4 y^{2}\right)$
Factorise the following quadratic polynomials by splitting the middle term
$12 x^{2}+23 x+5$
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