5sqrt(2) * 4
= 20sqrt(4)
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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
4√5 + 4√5 = 8√5.
radical 30
(Square root of 5) times 4
6 radical 2