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= 2√25x7 - 5√49x7 + √9x7 - 3√16x7
= (2x5√7) - (5x7√7) + 3√7 - (3x4√7)
= 10√7 - 35√7 + 3√7 - 12√7
= -24√7
2. 2√3 = 2√3 x 2√5 + 3√2
2√5 - 3√2 2√5 - 3√2 2√5 + 3√2
= 4√15 + 6√6
4√25 - 6√4
= 4√15 + 6√6
20 - 12
= 4√15 + 6√6
8