Number 13 please show me in the least steps possible

asked Dec 12, 2015 111k views

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$(\sqrt3)/(-\sqrt21)=\\ -(√(63))/(21)=\\ -(3\sqrt7)/(21)=\\ -(\sqrt7)/(7)$

Howard answered Dec 13, 2015

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$(\sqrt3)/(-√(21))=-\sqrt(3)/(21)=-\sqrt(1)/(7)=-(\sqrt1)/(\sqrt7)=-(1)/(\sqrt7)=-(1)/(\sqrt7)*(\sqrt7)/(\sqrt7)=-(\sqrt7)/(7)$

Nicholas Lu answered Dec 15, 2015

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