A rectangular yard has a length 4 feet greater than its width. If both dimensions are increased by 7 feet, which expression gives the resulting increase in area?
A) 18x+77
B) x^2+14x+77
C) 14x+77
D)x^2+18x+77
A) 18x+77
B) x^2+14x+77
C) 14x+77
D)x^2+18x+77
-
(x+7)(x+11) - x(x+4) = x² + 18x + 77 - x² - 4x = 14x+77