sqrt(12)*sqrt(20) = sqrt(12*20) = sqrt(240) = sqrt(16*15) = sqrt(16)*sqrt(15) = 4*sqrt(15)
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20
12 radical 6 x 6 radical 6 = 72 x 6 = 432
20 times the square root of 2
Here is an example, radical 20 plus radical 5. Now radical 20 is 2(radical 5) so we can add radical 5 and 2 radical 5 and we have 3 radical 5.
12 times the square root of 7.