√18 divided by √2

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`sqrt(18)/ sqrt(2)` rationalize the denominator (which will eliminate square root denominator)

= `sqrt(18)/ sqrt(2) times sqrt(2)/sqrt(2)`

= `sqrt(36)/ 2` A square root can be positive or negative therefore

= `6/2` or `(-6)/2`

**=3 or -3**

3 or -3

This may seem like a small point, but the algebra textbook here in California says that radical symbol without a negative sign refers to the positive root.

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