If $(\alpha -\beta ), \alpha , (\alpha +\beta )$ are zeroes of the polynomial $p\left(x\right)=2x^3-16x^2+15x-2$, value of $\alpha$ is

Which of the following is not a graph of a quadratic polynomial?

If $\mathrm{\alpha }$ and $\mathrm{\beta }$ are zeroes of a quadratic polynomial such that $\mathrm{\alpha }+\mathrm{\beta }=12$ and $\mathrm{\alpha }-\mathrm{\beta }=6$. Then, the family of quadratic polynomials having $\mathrm{\alpha }. \mathrm{\beta }$ as its zeroes is given by

“Note: The option(d) of the question given in the book seems to have errors and the modified option(d) should be as given below.”