CAT Quant Practice Problems

Question: For real numbers x and y, let

\(f\left( {x,y} \right) = \left\{ \begin{array}{l}{\rm{Positive\; square\; root \;of\; }}\left( {x + y} \right),{\rm{if }}{\left( {x + y} \right)^{0.5}}{\rm{\; is\; real}}\\{\left( {x + y} \right)^2},{\rm{ otherwise}}\end{array} \right.\)

\(g\left( {x,y} \right) = \left\{ \begin{array}{l}{\left( {x + y} \right)^2},{\rm{ if }}{\left( {x + y} \right)^{0.5}}{\rm{\; is\; real}}\\ - \left( {x + y} \right),{\rm{ otherwise}}\end{array} \right.\)

Under which of the following conditions is f(x, y) necessarily greater than g(x, y)?

  1. Both x and y are less than –1
  2. Both x and y are positive
  3. Both x and y are negative
  4. y > x

Correct Option:1

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