rationalize 1 upon root 7 +2
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![1 \div \sqrt{7 } + 2 1 \div \sqrt{7 } + 2](https://tex.z-dn.net/?f=1+%5Cdiv++%5Csqrt%7B7+%7D++%2B+2)
so multiply root7-2 both numerator and denominatorso
![\sqrt{7 } - 2 \div 7 - 4 \sqrt{7 } - 2 \div 7 - 4](https://tex.z-dn.net/?f=+%5Csqrt%7B7+%7D++-+2+%5Cdiv+7+-+4)
so
![\sqrt{7} - 2 \div 3 \sqrt{7} - 2 \div 3](https://tex.z-dn.net/?f=+%5Csqrt%7B7%7D+-+2+%5Cdiv+3)
so multiply root7-2 both numerator and denominatorso
so
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