Length: L
width: L - 18
Area (A) =L x w
1440 = L(L - 18)
1440 = L² - 18L
0 = L² - 18L - 1440
0 = ( L + 30)( L - 48)
0 = (L + 30) 0 = (L - 48)
L = -30 L = 48
Since length cannot be negative, disregard -30
L = 48
width: L - 18 = 48 - 18 = 30
Answer: width=30 in, length=48 in
