1.

Find sum of 1-2√5 and 3+7√5.

Answer» 4+5√5
( 1-2√5 ) + (3+7√5)=\xa01-2√5 + 3+7√5= 1+ 3\xa0-2√5+7√5= 4+ (-2+ 7)√5= 4 + 5√5
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