2. > under the root sign; =0 makes sense.
( 1)3-x & gt； =0，x & lt=3
(2)2x- 1 & gt； 0, because it is on the denominator, it cannot be 0.x >; 0.5
3. 500 under root number (1) =100 under root number 5 * =10× root number 5.
(2) Under the root number 12x = under the root number 4 * = 2x (root number 3x)
(3) 4 under radical number and 2/3 =( 14/3) under radical number = (42/9) under radical number = (42)/ (9)= (42)/3.
(4) Two-thirds of 3a square under the root sign.
= (root number 2)/ the square of 3a under the root number
= (root number 2)/(absolute value of 3a)
The absolute value is taken because we don't know whether 3a is positive or negative.