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√3 x √21 = √3 x √(3 x 7) = (√3 x √3) x √7) = 3√7
The square root of 12 may be simplified to 2 times the square root of 3.
12 times 5 is 60
sqrt(3) x sqrt(15) = sqrt( 3 x 15 ) = sqrt( 45 ) = sqrt( 9 x 5 ) = 3 sqrt(5)
It is: 12 times sq rt of 6