Evaluate using suitable identity.

$109\times 109$

Check the following algebraic expression is polynomial or not.

$2x+5$

Check the following algebraic expression is polynomial or not.

$\frac{3x^2-7x}{2}$

Check the following algebraic expression is polynomial or not.

$\frac{6}{7}{x}^3+\frac{2}{3}{x}^2+5$

Check the following algebraic expression is polynomial or not.

$\frac{p^3-3p^2+5}{p}$

Check the following algebraic expression is polynomial or not.

$\frac{9}{17}-\frac{4}{x}$

Check the following algebraic expression is polynomial or not.

$\frac{6x^2-\frac{3}{8}{x}^3+6x+2}{x^{-1}}$

Identify the terms, and their numerical coefficients for the following expression.

$3x^{2}y-2xyz$

Identify the terms, and their numerical coefficients for the following expression.

$x^2+2x+1$