Find the Definite Integral by Computing an Area $$\int _ { - 3 } ^ { 3 } ( 2 x + 6 ) d x$$

Multiple Choice

Find the definite integral by computing an area.
- $$\int _ { - 3 } ^ { 3 } ( 2 x + 6 ) d x$$

A) 36
B) 18
C) 12
D) 72