SOLUTION: I'm not sure how to do this question. is there a formula/law? Please explain working out. Thanks Simplify: 3^(n-1)+3^(n-1)+3^(n-1)

Algebra ->  Exponents -> SOLUTION: I'm not sure how to do this question. is there a formula/law? Please explain working out. Thanks Simplify: 3^(n-1)+3^(n-1)+3^(n-1)       Log On


   

Question 1026226: I'm not sure how to do this question. is there a formula/law? Please explain working out. Thanks
Simplify:
3^(n-1)+3^(n-1)+3^(n-1)
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+3%5E%28+n-1+%29+%2B+3%5E%28+n-1+%29+%2B+3%5E%28+n-1+%29+
This is
+3%2A3%5E%28+n-1+%29+
+3%5E%28+n-1%2B1+%29+
+3%5En+
-------------------
check answer:
Suppose +n=7+
+3%5E%28+n-1+%29+%2B+3%5E%28+n-1+%29+%2B+3%5E%28+n-1+%29+
+3%5E%28+7-1+%29+%2B+3%5E%28+7-1+%29+%2B+3%5E%28+7-1+%29+
+3%5E6+%2B+3%5E6+%2B+3%5E6+
+3%2A3%5E6+=+3%5E7+
looks right