CAT Quant Practice Problems

Question: If \(xy + yz + zx = 0,{\rm{then}}{\left( {x + y + z} \right)^2}\) equals

\({\left( {x{\rm{ }} + {\rm{ }}y} \right)^2} + xz\)
\({\left( {x{\rm{ }} + {\rm{ }}z} \right)^{2{\rm{ }}}}{\rm{ + }}xy\)
\({x^2} + {y^2} + {z^2}\)
\(2\left( {xy{\rm{ }} + {\rm{ }}yz{\rm{ }} + {\rm{ }}xz} \right)\)
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