Question 273618
Width = x

Length = 6+x

Area = length X width

91=x(x+6)
91=x^2 + 6x
0= x^2 +6x-91
0=(x+13)(x-7)

x=-13 or x=7

Since distance can not be negative the x=-13 is an erroneous answer

Check

91=7(6+7)
91=91