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= 2√5 + 2√ (25 x 5) - √ (25 x 3) - 3 √ (9 x5)
= 2√5 + 2 x5 √5 - 5√3 - 3x3√5
= 2√5 + 10√5 -5√3 - 9√5
= 2 + 10 - 9√5 - 5√3
= 3√5 -5√3