The following expressions are polynomials? Justify your answer:
$1-\sqrt{5 x}$
Write the degree of the following polynomials
$11-2 y^{2}$
If $x+2$ is a factor of $x^{3}+a x^{2}-x+30,$ find the value of $a$.
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
$\sqrt{3} x^{2}+\pi x-9$
From the following polynomials find out which of them has $(x+1)$ as a factor
$x^{3}+10 x^{2}+23 x+14$