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√2 Multiplicas y divides por la conjugada del denomi-
----------- = nador (√2 - √7)
√2 + √7
√2 (√2 - √7)
------------- x ----------------- = Aplicas en el denominador
(√2 + √7) (√2 - √7 ) (a + b)(a - b) = a² - b²
√2(√2 - √7)
----------------- =
(√2)² - (√7)²
√2*√2 - √2√7
------------------ =
2 - 7
(√2)² - √14
--------------- =
- 5
2 - √14
---------- =
-5
- 2 + √14
------------
5
Respuesta.
-2 + √14
-----------
5