The zero of the polynomial $p(x) = bx + m$ is $\ldots \ldots \ldots$

Give a possible expression for the length of a side of a square whose area is $(9x^2 + 30x + 25)$ square units, where $(x > 0)$.

If the polynomials $ax^3 + 4x^2 + 3x - 4$ and $x^3 - 4x + a$ leave the same remainder when each is divided by $x - 3$,find the value of $a$.

Is the following expression a polynomial? Justify your answer: $1-\sqrt{5x}$

State whether the following statement is True or False. Justify your answer.
$A$ polynomial cannot have more than one zero.

On dividing $x^{3} + ax^{2} + 19x + 20$ by $(x + 3)$,if the remainder is $a$,then find the value of $a$.