Question
If x * y = (x + 3)2 (y - 1), then the value of 5 * 4 is?
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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$$\eqalign{
& x*y = {\left( {x + 3} \right)^2}\left( {y - 1} \right) \cr
& \Leftrightarrow 5*4 = {\left( {5 + 3} \right)^2}\left( {4 - 1} \right) \cr
& \Leftrightarrow 5*4 = 64 \times 3 \cr
& \Leftrightarrow 5*4 = 192 \cr} $$
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