Classify the following as linear, quadratic or cubic polynomial

$4 y+11$

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

Without actually calculating the cubes, find the value of $48^{3}-30^{3}-18^{3}$

If $x+1$ is a factor of the polynomial $2 x^{2}+k x,$ then the value of $k$ is

Find the value of the polynomial $3 x^{3}-4 x^{2}+7 x-5,$ when $x=3$

Find the value of the polynomial $x^{2}-7 x+12$ at.

$x=3$