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= 2√(9 x 5) + 3√(4 x 5) - 5√(25 x 5)
= 6√5 + 6√5 - 25√5
= 13√5
2. 2√512 + √243 - 3√32 + 4√27
= 2√( 256 x 2) + √( 81 x 3) + 4√( 9 x 3)
= 32√2 + 9√3 + 12√3
= 32√2 + 21√3
3. 4√63 - 4√20 - 2√175 + 5√125
= 4√(9 x 7) - 4√(4 x 5) - 2√(25 x 7) + 5√(25 x 5)
= 12√7 - 8√5 - 10√7 + 25√5
= 17√5 + 2√7