If $\frac{x}{y}+\frac{y}{x}=-1(x, y \neq 0),$ the value of $x^{3}-y^{3}$ is

Verify whether the following are True or False:

$-3$ is a zero of $x-3$

State whether each of the following statements is true or false

The degree of polynomial $5 x^{2}-7 x+2$ is $5 .$

Evaluate

$205 \times 195$

One of the factors of $\left(25 x^{2}-1\right)+(1+5 x)^{2}$ is