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Question

simplify the following expressions.

* (5+√7)(2+√5)

* (5+√5)(5-√5)

* (√3+√7)³

*(√11-√7)(11+√7)

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Solution

1. 5+72+5=52+5 + 72+5=10 + 55 + 27 + 352. 5 + 55 - 5=52 - 52=25 - 5= 203.3+73=33+73 + 3327 + 3372=33 + 77 + 97 + 213=243 + 167

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