Find the zero of the polynomial : $p(x) = 3x$

Write the degree of each of the following polynomials :

$(i)$ $5 x^{3}+4 x^{2}+7 x$

$(ii)$ $4-y^{2}$

Write the following cubes in the expanded form : $(5 p-3 q)^{3}$

Classify the following as linear, quadratic and cubic polynomials :

$(i)$ $1+x$

$(ii)$ $3 t$

$(iii)$ $r^{2}$

$(iv)$ $7 x^{3}$

Check whether $-2$ and $2$ are zeroes of the polynomial $x + 2$.