Question

Need help solving for r!

6^(-r-1)=216

Answer 1

would this be 6^(-r-1)=6^3?

Answer 2

and then -r-1=3?

Answer 3

Note that you have 6 as base on both sides of your initial equation.

If the bases are the same, as they are here, then you may equate the exponents, obtaining the much simpler equation

-r-1=3, exactly as @ali1029 has already stated.

Solve this for r.

In your shoes, I'd add r to both sides, and then subtract 3 from both sides. Go for it.

Answer 4

i got r= -4

thank you very much for explaining!! :)