first the two numbers have the same radicand which is radical 2 so we just
add the numbers before them to become 7 radical 2
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3root(6)+5root(2) you really answered it yourself!
2 + 3 + 4 = 9
yes if you are doing it this way: 3+2=2+3
factor the 18. 18=2x3x3. Take out the 3 because it is squared. 5x3 radical 2=15radical2
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