Find the value of the polynomial $p(x) = 5x - 4x^2 + 3$ at $x = 2$.

For polynomial $p(x) = x^{3} - 3x^{2} + 8x + 12$,find the value of $p(-1)$.

Is the following expression a polynomial? Justify your answer:
$\frac{(x-2)(x-4)}{x}$

Which one of the following is a polynomial?

Which of the following expressions is a polynomial? State the reason. If an expression is a polynomial,state whether it is a polynomial in one variable or not: $x^{2}-15x+50$

For the polynomial $p(x) = x^{2} - 7x + 12$,find the value of $p(2)$.