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= 9√30 + 3 √180
= 9√30 + 3√9√5√4
= 9√30 + 3*3*2√5
= 9√30 + 18√5
b. 2√5 x (2√120 + 5√24)
= 4√600 + 10√120
= 4√100√6 + 10√4√30
= 40√6 + 20√30