If x * y = (x + 3)2 (y - 1), then the value of 5 * 4 is?

Answer: Option A

$$\begin{array}{rl}& x\ast y={\left(x+3\right)}^2\left(y-1\right)\\ & \iff 5\ast 4={\left(5+3\right)}^2\left(4-1\right)\\ & \iff 5\ast 4=64\times 3\\ & \iff 5\ast 4=192\end{array}$$