Let ‘a’ be a real number such that the function  $\mathrm{f}\left(\mathrm{x}\right)={\mathrm{ax}}^2+6\mathrm{x}-15 \mathrm{x}\in \mathrm{R}$ is increasing in  $\left(-\infty ,\frac{3}{4}\right)$ and decreasing in $\left(\frac{3}{4},\infty \right)$ then the function $\mathrm{g}\left(\mathrm{x}\right)={\mathrm{ax}}^2-6\mathrm{x}+15, \mathrm{x}\in \mathrm{R}$ has a: