Math, asked by chiefprashant, 1 year ago

rationalize the given fraction


the answer should be in fraction

Attachments:

TobyHark: Answer is 36+ 2root 5/ 4
TobyHark: Srry wrong answer
TobyHark: answer is 3+ root 5/ 2

Answers

Answered by kumarsuresh237p9qz6n
2
hope it is helpful for you
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Answered by Anonymous
1
hiii!!!

here's Ur answer...

given \:  =  >  \frac{7 + 3 \sqrt{5} }{3 +  \sqrt{5} }  \\  \\  =  \frac{7 + 3 \sqrt{5} }{3 +  \sqrt{5} } \times  \frac{3 -  \sqrt{5} }{3 -  \sqrt{5} }  \\  \\  =  \frac{(7 + 3 \sqrt{5} )(3 -  \sqrt{5}) }{(3 +  \sqrt{5} )(3 -  \sqrt{5} )}  \\  \\  =  \frac{7(3 -  \sqrt{5}) + 3 \sqrt{5}(3 -  \sqrt{5}   )}{ {(3)}^{2} -  {( \sqrt{5} )}^{2}  }  \\  \\  =  \frac{21 - 7 \sqrt{5}  + 9 \sqrt{5} - 3 \sqrt{25}   }{9 - 5}  \\  \\  =  \frac{21 + 2 \sqrt{5}  - (3 \times 5)}{4}  \\  \\  =  \frac{21 - 15 + 2 \sqrt{5} }{4}  \\  \\  =  \frac{6 + 2 \sqrt{5} }{4}  \\  \\  =   \frac{3 +  \sqrt{5} }{2}

hope this helps..!!

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