4√5 + 4√5 = 8√5.
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2√20 - 3√7 - 2√5 + 4√63 = 2√(4 x 5) - 3√7 - 2√5 + 4√(9 x 7) = 4√5 - 2√5 - 3√7 + 12√7 = 2√5 + 9√7
6 radical 2
4 radical 6
3root(6)+5root(2) you really answered it yourself!
69 its so freakin easy