Math, asked by minakshidarji1905, 7 months ago

simplify by rationalising the denominator7+2√5/7-2√5

Answers

Answered by mhanifa

1

Answer:

(69 + 28√5)/29

Step-by-step explanation:

(7+2√5)/(7-2√5) =
(7+2√5)(7+2√5)/(7-2√5)(7+2√5) =
(7² + 2*7*2√5 + (2√5)²)/ (7² - (2√5)²) =
(49 + 20 + 28√5)/(49 - 20) =
(69 + 28√5)/29

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