Hello All! Would anyone mind helping me with rationalizing denominators?

Question

anonymous · Answer

sure :)

anonymous · Answer

Is there a specific formula for this?

anonymous · Answer

well do u have an example problem? it would b easier to explain with one

anonymous · Answer

the first one is $$7/\sqrt{5}$$

anonymous · Answer

the slash line is equivalent to a fraction, FYI :)

anonymous · Answer

....

anonymous · Answer

if you don't know it, that is fine.

anonymous · Answer

ok so what you do is you multiply both the numerator and the denominator by the square root of 5.

so you have    7*square root of 5
                      __________________
                       square root of 5* square root of 5.

this gives you 7square root of 5
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                        5

anonymous · Answer

does this help? sorry i dont know how to do the square root sign on here....

anonymous · Answer

yes- you basically simplify the it to be 7$$\sqrt{5}/5$$

anonymous · Answer

yep :) if u think i helped, then click the good answer button :)

anonymous · Answer

hhaha thanks. how about this one: 8 OVER 3+ sqrt 7

anonymous · Answer

hello?

anonymous · Answer

$$\frac{8}{3+\sqrt{7}}=12-4 \sqrt{7}  $$