Expressed as a surd in its simplest form, 5 sqrt(20) = 10 sqrt(5).
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5 radical 2 (5√2)
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
It is an expression that can be simplified to: 3x-20
3 radical 5
6√5 + 2√5 - 7 = 8√5 - 7, which cannot be simplified.