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

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

Factorise

$25 x^{2}+25 x+6$

Which of the following expressions are polynomials in one variable and which are not $?$ State reason for your answer. If the given expression is a polynomial, state whether it is a polynomial in one variable or not

$5 x^{2}-7 x+3 \sqrt{x}$

Evaluate

$103 \times 97$

Find $p(0), p(1), p(-2)$ for the following polynomials:

$p(x)=10 x-4 x^{2}-3$