sqrt(3) x sqrt(15) = sqrt( 3 x 15 ) = sqrt( 45 ) = sqrt( 9 x 5 ) = 3 sqrt(5)
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You can multiply the radicands together if the radical is the same. So, the answer is radical 13*17=radical 221
The square root of 12 may be simplified to 2 times the square root of 3.
√2*√70 = √2*√2*√35 = 2√35 which cannot be simpified further.
90