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4) √7 +2√10 = √5+2 +2√5x2
= √5 + √2
5) √15 +2√26 = √13+2 + 2√13x2
= √13 + √2
6) √27 + 10√2 = √27 + 2x5√2
= √27 + 2√2x25
= √27 + 2√50
= √25+2 + 2√25x2
= √25 + √2
= 5 + √2
7) √19 + 6√10 = √19 + 2x3√10
= √19 + 2√10x9
= √19 + 2√90
= √14+5 + 2√14x5
= √14 + √5