Question 1017282
Hi there,
Make width = x
Length = (12 + 2x)
Area = Width x Length
54 = x(12 + 2x)
54 = 12x + 2x^2
Rearrange
2x^2 + 12x - 54 = 0
(2x - 6)(x + 9) = 0
x + 9 = 0
x = -9 (Discounted as -ve)
2x - 6 = 0
2x = 6
x = 3
Width of wall = 3 ft
Length of wall = 18 ft
Hope this helps :-)