$$\begin{align*} &\Rightarrow T(n) = F(n)*G(n) + H(n)*F(n) \\ &\Rightarrow \text{Given} \;\; F(n) = c.n^2 \\ &\Rightarrow T(n) = \left [ c.n^2*{\color{green}{G(n)}} \right ]_{1st} + \left [ {\color{red}{H(n)}}*c.n^2 \right ]_{2nd} \\ &\Rightarrow T(n) = \left [ c.n^2*{\color{green}{n}} \right ]_{1st-MIN} + \left [ {\color{red}{\log n}}*c.n^2 \right ]_{2nd-MAX} \\ &\Rightarrow T(n) = \left [ c.n^3 \right ]_{1st-MIN} + \left [ c.n^2.{\color{red}{\log n}} \right ]_{2nd-MAX} \\ &\Rightarrow T(n) = \Omega({\color{red}{n^3}}) \\ \end{align*}$$