Find the quotient and the remainder when $x^{3}+x^{2}-10 x+8$ is divided by

$x+3$

Classify the following polynomials as polynomials in one variable, two variables etc.

$x^{2}-2 x y+y^{2}+1$

Classify the following as a constant, linear,quadratic and cubic polynomials:

$3$

The following expressions are polynomials? Justify your answer:

$1-\sqrt{5 x}$

Expand

$(2 x-7)(2 x-5)$