Question

the area of a rectangular field is 3a2+5ab+2b2. one of its side is (a+b). find the length of the fence around the field

Answer 1

Area of square field = 5184m^2
Square root of 5184 = 72m 
Therefore perimeter of square field = 4 * 72 = 288m
Rectangular field.
Breadth = x
Length = 2x
Perimeter = 2*length + 2*breadth
= 2(2x) + 2(x)
= 6x
Perimeter of rect field = Perimeter of square field.
6x = 288m
x = 48m
Breadth of rectangular field = 48m
Length of rectangular field = 96m.
Hope this helps.