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= √16x2 + √4x2 + √25x2 - √49x2
= 4√2 + 2√2 + 5√2 - 7√2
= 4√2
2). √20 x √27
= √4.5 x √9.3
= 2√5 x 3√3
= 6√15
3). (√12+√5)(√12-√5)
= 12 - √60 + √60 -5
= 7
4). 5 - √10 + √10 - 2
= 5-2
= 3
5). 5 + √15 + √15 + 3
= 5 + 2√15 + 3
= 10√15