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If x y = (x + 3)2 (y - 1) then...

This question belongs to Arithmetic Ability Algebra
Algebra
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If x * y = (x + 3)2 (y - 1), then the value of 5 * 4 is?

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Correct Answer: Option A
$$\eqalign{ & x*y = {\left( {x + 3} \right)^2}\left( {y - 1} \right) \cr & \Leftrightarrow 5*4 = {\left( {5 + 3} \right)^2}\left( {4 - 1} \right) \cr & \Leftrightarrow 5*4 = 64 \times 3 \cr & \Leftrightarrow 5*4 = 192 \cr} $$
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