Evaluate using suitable identities : $(998)^{3}$

Which one of the following is a polynomial?

Write the coefficient of $x^{2}$ in each of the following:

$(i)$ $\frac{\pi}{6} x+x^{2}-1$

$(ii)$ $3 x-5$

Zero of the polynomial $p(x)=2 x+5$ is

Show that :

$2 x-3$ is a factor of $x+2 x^{3}-9 x^{2}+12$

 ...... is one of the factors of $p(x)=x^{3}-3 x^{2}+7 x-5$