Indices Question (1 Viewer)

[naq69]

Simplify the following expressing them with positive indices (q8 and 9)

8.a) 3^2n/15^n-1 + 25^2n-1/15^n-1
9.a) 4^-2 x 6^3 x 8^4 x 12^-2
b) 15^n+1/9n-1 x 25^n-2 x 25/9n-1 x 25^n-2 x 5^3n-4/9n-1 x 25^n-2

find the value of x that makes each of the following true:
11.i) 3/5^x+2 x 5^x/5^x+2 - 1/5^x+2

As u can see i struggle with indices with base form of a numerals rather then pronumerals

Any help will be appreciated
thanks

 

[fullonoob]

8) isnt it just (3^2n + 25^(2n-1) )/ 15^(n-1)
Theres no brackets or anything so not sure what the question is

By positive indices you mean all indices on the top fraction or waht O_O
otherwise (3^2n + 25^(2n-1) ) (15^(n-1))^-1

 

[naq69]

mm sorry ill make it more easier
the brakets didnt occur to me
ok

8. (3^2n + 25^(2n-1))/15^n-1
9.a) 4^-2 x 6^3 x 8^4 x 12^-2
b) (15^(n+1) x 25 x 5^(3n-4))/9^(n-1) x 25(n-2)

Find x so that each of its true
11. (3 x 5^x -1)/5^x + 2=2

 

[fullonoob]

I think its something like this O_O

sorry i dont know how to enter using the latex equation