Factorise

$16 x^{2}-40 x y+25 y^{2}$

The following expressions are polynomials? Justify your answer:

$\frac{1}{2 x}$

Find the zeroes of the polynomial in each of the following:

$g(x)=3-6 x$

Classify the following as a constant, linear,quadratic and cubic polynomials:

$4-5 y^{2}$

Write the following cubes in expanded form

$(3 a+5 b)^{3}$

By using the factor theorem, show that $(x+2)$ is a factor of the polynomial $6 x^{3}+19 x^{2}+16 x+4$ and then factorise $6 x^{3}+19 x^{2}+16 x+4$