Answer:
-2a^2 + 15a + 6
Explanation:
You just might find it helpful to arrange these two expressions in a column:
(8a-2a^2)
+(6+7a)
and then to rearrange each equation in descending poers of a:
-2a^2 + 8a + 0
+ 7a + 6
----------------------
Performing the indicated additions, we get:
-2a^2 + 8a + 0
+ 7a + 6
----------------------
-2a^2 + 15a + 6