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b. (6 - 2√3)(1+√3) = (6 x 1) + (6 x √3) + ((-2√3) x 1) + ((-2√3) x √3) = 6 + 6√3 - 2√3 - 6 = 6 - 6 + 6√3 - 2√3 = 4√3
c. 3√5 + 6√20 - √80 = 3√5 + 6√4.√5 - √16.√5 = 3√5 + 6.2√5 - 4√5 = 3√5 + 12√5 - 4√5 = 3 + 12 + 4 (√5) = 11√5