Write the coefficients of $x^{2}$ in each of the following polynomials

$3 x^{3}-8 x^{2}+14 x-5$

Without finding the cubes, factorise

$(x-2 y)^{3}+(2 y-3 z)^{3}+(3 z-x)^{3}$

Factorise $: 49 x^{2}-121$

Find the value of each of the following polynomials at the indicated value of variables

$q(y)=5 y^{3}-4 y^{2}+14 y-\sqrt{3}$ at $y=2$

Expand

$(3 x-2)(3 x-6)$

Without actually calculating the cubes, find the value of each of the following

$(0.2)^{3}-(0.3)^{3}+(0.1)^{3}$