SOLUTION: Simplify 7^n-3×7^(n+1) / 20×7^(n-2)×7^(n+1)

Algebra ->  Square-cubic-other-roots -> SOLUTION: Simplify 7^n-3×7^(n+1) / 20×7^(n-2)×7^(n+1)      Log On


   

Question 1020910: Simplify
7^n-3×7^(n+1) / 20×7^(n-2)×7^(n+1)
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Assume the problem is:
%287%5E%28n-3%29%2A7%5E%28n%2B1%29%29+%2F+%2820%2A7%5E%28n-2%29%2A7%5E%28n%2B1%29%29
Cancel 7^(n+1)
%287%5E%28n-3%29%29+%2F+%2820%2A7%5E%28n-2%29%29
Combine like terms to give a positive exponent
1+%2F+%2820%2A7%5E%28%28n-2%29-%28n-3%29%29%29
remove brackets
1+%2F+%2820%2A7%5E%28%28n-2-n%2B3%29%29%29 = 1+%2F+%2820%2A7%5E%281%29%29%29 = 1%2F140