√(144/256) = √(12^2/16^2) = 12/16 = 3/4
√(121/169) = √(11^2/13^2) = 11/13
√(225/361) = √(15^2/19^2) = 15/19
(3√5)^2 = 3^2*5 = 9*5 = 45
(2√7)^2 = 2^2*7 = 4*7 = 28
(4√2)^2 = 4^2*2 = 16*2 = 32
(5√3)^2 = 5^2*3 = 25*3 = 75
(-√4)^2 = (√4)^2 = 4
(-√5)^2 = (√5)^2 = 5
-(√15)^2 = -15
-(√20)^2 = -20