## Anguyennn one year ago Hello could I get some help with evaluating 2√5/√7

1. kittiwitti1

$2\sqrt{5}\sqrt{7}\text{ or }2\sqrt{5\sqrt{7}}?$

2. Anguyennn

none of those

3. Anguyennn

here ill draw it out for you

4. Anguyennn

|dw:1442638593539:dw|

5. Anguyennn

I want to know how to do it

6. Anguyennn

algebraically

7. triciaal

|dw:1442646154332:dw|

8. triciaal

rationalize the denominator to get rid of the radical in the denominator. means multiply by one expressed as shown square root of a number * square root of a number = that number

9. UnkleRhaukus

@triciaal is right $\frac{2\sqrt 5}{√7}\\ =\frac{2\sqrt 5}{√7}\times1\\ \frac{2\sqrt 5}{√7}\times\frac{\sqrt7}{\sqrt7}\\ \frac{2\sqrt 5\times\sqrt7}{√7\times\sqrt7}\\ =\tfrac27\sqrt5\sqrt7$

10. triciaal

I would end at (2 root 35)/7 to have only one radical

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