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Questions  >>  CBSE XII  >>  Math  >>  Relations and Functions
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Prove that relation R defined on the set N of natural numbers by \[x\;R\;y \Leftrightarrow 2x^2-3xy+y^2=0\] is not symmetric but it is reflexive.

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Suppose xRy implies 2x^2−3xy+y^2=0 2x^2-(x^2)−3xy+y^2+y^2=y^2-x^2 x^2−3xy+2y^2=y^2-x^2 x^2−3xy+2y^2=0 iff y^2-x^2=0 i.e, yRx Iff y^2=x^2 Iff. Y=+x or -x But y is inN implies that y=x, ie reflexive
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