Which of the following expressions is a polynomial, state the reason ? If an expression is polynomial, state whether it is a polynomial in one variable or not

$\sqrt{3} x^{2}+\pi x-9$

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

Find the following products:

$\left(x^{2}-1\right)\left(x^{4}+x^{2}+1\right)$

Find the zeroes of the polynomial:

$p(x)=(x-2)^{2}-(x+2)^{2}$

Write the degree of each of the following polynomials

$x^{50}-1$

Evaluate

$(65)^{2}$