Multiply
= sqrt ( (24*18*15)*(x*y*y) )
= sqrt ( ( 2^2 *6 * 3^2 *2 * 15 ) * xy^2 )
= 2*3*y sqrt(6 *2*15 x)
= 6y sqrt( 180 x)
= 6y sqrt ( 36 * 5 x)
= 6y sqrt (6^2 * 5x)
= 36 y sqrt (5x)