Question 719014
Solution:

Let 'a' mt be the initial length of the square garden.
New length of the side = (a + 7 ) m

Given : Area of the square garden after increasing each side = 144 sq.m

{{{(a+7)^2 = 144 = 12^2}}}

{{{(a+7) = 12}}}
or a = 5 m

Therefore , initial length of the each side of the original garden = 5 mt.