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$\left(\frac{x}{2}-\frac{2}{5}\right)^{2}$

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

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

State whether each of the following statements is true or false

$x^{2}-8 x+12=(x-6)(x-2)$

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

$x^{2}+x+1$

Which one of the following is a polynomial?

Dividing $p(x)=x^{2}+12 x+36$ by $(x+5)$ the remainder is.......