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
$3 x^{2}+5 x-7+\frac{8}{x}$
Degree of the polynomial $4 x^{4}+0 x^{3}+0 x^{5}+5 x+7$ is
The following expressions are polynomials? Justify your answer:
$\frac{1}{x+1}$
From the following polynomials find out which of them has $(x-1)$ as a factor
$x^{3}+6 x^{2}-9 x-14$
State whether each of the following statements is true or false
In polynomial $5 x^{3}-3 x^{2}+11 x-14,$ the coefficient of $x^{3}$ is $3.$