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This is an extremely simple problem, but I can't find an example anywhere for some reason.

I know that $30^k$ is not correct

But I have no idea what else makes sense.

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  • $\begingroup$ Hint: $ \ 25^k \ = \ (5^2)^k \ = \ 5^{2k} \ = \ 5^{k \ \cdot \ 2} \ = \ (5^k)^2 \ $ . $\endgroup$
    – colormegone
    Feb 5, 2016 at 0:30
  • $\begingroup$ "What is <some algebraic expression>" is a question that can't be answered without guesswork on our part. If you want help with simplifying or calculating an expression say so. $\endgroup$
    – Rob Arthan
    Feb 5, 2016 at 0:37
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    $\begingroup$ You're right, I just thought this could be further simplified, but I was incorrect. $\endgroup$
    – 123
    Feb 5, 2016 at 0:44

1 Answer 1

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This is about a simplified as you can get. You can also write it as $5^k(5^k+1)$. if you prefer that. There's no simple formula like $a^k$.

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