Explanation

.The square root of 1.44 can be written as (1.44)1/2. So

(1.44)1/2 = (1.2 × 1.2)1/2

(1.44)1/2 = [(1.2)2]1/2

(1.44)1/2 = (1.2)2/2

(1.44)1/2 = (1.2)1

Thus,

√1.44 = 1.2