Factorise $9x^{2} + 42x + 49$.

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

Find the quotient and the remainder when $2x^2 - 7x - 15$ is divided by $2x - 3$.

Classify the following as a constant,linear,quadratic,or cubic polynomial: $2-x^{2}+x^{3}$

The zero of the polynomial $5x - 10$ is:

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: $\sqrt{3} x^{2}+\pi x-9$