Represent the Area of the Shaded Region in the Following $6 x ^ { 2 } + 5 x - 6$

Represent the area of the shaded region in the following figure, where a = 6, b = 7, c = 2 and d = 3.

A) $6 x ^ { 2 } + 5 x - 6$
B) $6 x ^ { 2 } + 5 x + 6$
C) $6 x ^ { 2 } - 5 x - 6$
D) $6 x ^ { 2 } - 5 x + 6$