Using a suitable identity,evaluate the following:
$999^{2}$

Which of the following expressions is a polynomial? State the reason. If an expression is a polynomial,state whether it is a polynomial in one variable or not: $3x^2 + 5x - 7 + \frac{8}{x}$

Factorise $: x^{3}+x^{2}-26 x+24$

Find the zero of the polynomial in the following case:
$p(x) = 3x - 4$

Find the quotient and the remainder when $2x^2 - 7x - 15$ is divided by $x - 2$.

Factorise:
$1+64 x^{3}$