Using a suitable identity,evaluate the following:
$103^{3}$

Without actually calculating the cubes,find the value of each of the following:
$\left(\frac{1}{2}\right)^{3}+\left(\frac{1}{3}\right)^{3}-\left(\frac{5}{6}\right)^{3}$

Evaluate $(98)^{2}$.

Evaluate the following product without multiplying directly: $84 \times 79$

In the polynomial $5x^{3} - 3x^{2} + 11x - 4$,the coefficient of $x^{2}$ is......

Factors of $x^{2}-23x+120$ are.........