Factorise :
$x^{2}+9 x+18$
$\sqrt{2}$ is a polynomial of degree
The following expressions are polynomials? Justify your answer:
$\frac{1}{x+1}$
Classify the following as linear, quadratic or cubic polynomial
$5-3 t$
If both $x-2$ and $x-\frac{1}{2}$ are factors of $p x^{2}+5 x+r,$ show that $p=r$