If a is a positive integer, then 2^a + 2^(a - 1) = Choose the most appropriate option:
A) 2^a
B) 2^(a + 1)
C) -1*(2^a)
D) 2a^(a + 1)
E) 3(2^a)
If a is a positive integer, then 2^a + 2^(a - 1) =   2^a + 2^(a - 1)   2^a(1-2)   -1*(2^a)   Option -1*(2^a) is answer
<result>C</result>
If a is a positive integer, then 2^a + 2^(a - 1) =